after visiting China,most of the foreign friends said they would never forget the time()theyhad spent in China.a.that b.what c.when d.at which 选a能用which替代吗?什么时候可以用when呢?为什么不可以用what?

after visiting China,most of the foreign friends said they would never forget the time()theyhad spent in China.a.that b.what c.when d.at which 选a能用which替代吗?什么时候可以用when呢?为什么不可以用what?
after visiting China,most of the foreign friends said they would never forget the time()they
had spent in China.
a.that b.what c.when d.at which 选a
能用which替代吗?
什么时候可以用when呢?
为什么不可以用what?

after visiting China,most of the foreign friends said they would never forget the time()theyhad spent in China.a.that b.what c.when d.at which 选a能用which替代吗?什么时候可以用when呢?为什么不可以用what?
可以用which that 或者不填来回答
因为是定语从句,而且是做spent的宾语（spend是及物动词 spend加时间金钱in doing）
用when 是代表定语从句不缺主宾表的情况下
比如
.when they have fun in china
或者 in which
此时定语从句不缺那些
what不用于定语从句
用于名词性从句 (希望这个回答能让你满意)

fuck you

可以用which that 或者不填来回答
因为是定语从句，而且是做spent的宾语（spend是及物动词 spend加时间金钱in doing）
用when 是代表定语从句不缺主宾表的情况下
比如
。。。。。。when they have fun in china
或者 in which
此时定语从句不缺那些
what不用于定语从句

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可以用which that 或者不填来回答
因为是定语从句，而且是做spent的宾语（spend是及物动词 spend加时间金钱in doing）
用when 是代表定语从句不缺主宾表的情况下
比如
。。。。。。when they have fun in china
或者 in which
此时定语从句不缺那些
what不用于定语从句
用于名词性从句

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可以用which 和that 或者不填，因为是定语从句，而且是做从句中谓语动词spent的宾语（spend是及物动词 ）
当从句中谓语动词是不及物动词，或是及物动词但不缺宾语时，表示时间可用when
what不能用于定语从句