请说明理由1,these trees must have been planted three years ago.___?a.weren't they?b.must'nt theyc.didn't theyd.haven't they2.an iron and steel works ,with some satelite factories,__to be built herea.are goingb.is goingc.shalld.will3.the boy and

请说明理由1,these trees must have been planted three years ago.___?a.weren't they?b.must'nt theyc.didn't theyd.haven't they2.an iron and steel works ,with some satelite factories,__to be built herea.are goingb.is goingc.shalld.will3.the boy and
请说明理由
1,these trees must have been planted three years ago.___?
a.weren't they?
b.must'nt they
c.didn't they
d.haven't they
2.an iron and steel works ,with some satelite factories,__to be built here
a.are going
b.is going
c.shall
d.will
3.the boy and girl each___toys
a.has her own
b.has their own
c.have their own
d.have his own

请说明理由1,these trees must have been planted three years ago.___?a.weren't they?b.must'nt theyc.didn't theyd.haven't they2.an iron and steel works ,with some satelite factories,__to be built herea.are goingb.is goingc.shalld.will3.the boy and
1.c.该题是推测性题的反问,应根据后面的three years ago,所以是过去式
2.b 这题把主语与谓语分离了,iron and steel 是一个概念,钢铁,works是工厂的意思,所以应该用单数.
3.c each 再这里表示的不是整体的概念而是个体的概念,故用复数形式,选c 楼上那位明显自我矛盾

1. b 因为前面用的是 must
2. a 复数用 are, shall to 和 will to 放在一起都不对
3. b each 代表的单数 用has boy and girl 是他们，用their第一题是选A的,因为有个have been.但是我不知道具体理由 第二题是选b的..不知道为什么是单数 第三题是选c....同样不知道理由好吧。。我答悲剧了。。=。= 按你...

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1. b 因为前面用的是 must
2. a 复数用 are, shall to 和 will to 放在一起都不对
3. b each 代表的单数 用has boy and girl 是他们，用their

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第一题，b绝对不对，选c似乎能说得过去，但是不确定。
第二题选b，就是单数，把with扔到最好即可，状语。主要是看an。
第三题选a。先是单数，再者是就近原则。
还是等高手回答，关注中。
楼上说得好，第三题的each还是做为副词吧，所以用复数。
第一题太晦涩，不记了。...

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第一题，b绝对不对，选c似乎能说得过去，但是不确定。
第二题选b，就是单数，把with扔到最好即可，状语。主要是看an。
第三题选a。先是单数，再者是就近原则。
还是等高手回答，关注中。
楼上说得好，第三题的each还是做为副词吧，所以用复数。
第一题太晦涩，不记了。

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