选一下a b c d.
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选一下a b c d.
选一下a b c d.
选一下a b c d.
ACDDCB
选一下a b c d.
帮我选一下a,b,c,d
a.b.c.d.e各是几点,顺便说一下为啥?
帮我判断一下A,B,C,D.
选 a b c d
选A、B、C、D
选a,b,c,d,
选a.b.c.d.
选A B C D
_____ is ____ hard work.A.study;a B.studies;a C.studying;a D.studying;/为什么选D不选C、讲解一下
What ______just now?A.was happened B.were happened C.happened D.happens选C,请帮我分析一下,
Why don't you come__________earlier?A、a little B、little C、more D、very (选词填空,希望说明一下)
What is his head ().A ball. A.likes B.like C.look like D.liking选什么?请问一下为什么?
B选是a-(b-c+d)=a一b十c-d:¥:D选是a+b-(-c-d)=a+b+c+d
A B C D
A B C D
(a+b)(c+d).
[a,b)×[c,d