I‘m not sure which classroom ______.A.to attend lecture B.to have lecture at C.to have lecture in D.having lecture in为什么不选D?

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I‘m not sure which classroom ______.A.to attend lecture B.to have lecture at C.to have lecture in D.having lecture in为什么不选D?
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I‘m not sure which classroom ______.A.to attend lecture B.to have lecture at C.to have lecture in D.having lecture in为什么不选D?
I‘m not sure which classroom ______.
A.to attend lecture B.to have lecture at
C.to have lecture in D.having lecture in
为什么不选D?

I‘m not sure which classroom ______.A.to attend lecture B.to have lecture at C.to have lecture in D.having lecture in为什么不选D?
sure to do something

因为which引导了一个一般现在时性质的从句，不能用现在进行时having。

因为这里要用动词不定时作CLASSROOM的定语。

适当形式填空 I'm not sure which restaurant (eat). I'm not sure I'm not sure which colors to sample,这句中which colors to sample是什么句子成分阿, I'm not sure which room he lives in.这个句子为什么不能写作 I'm not sure which room does he live in.或者I'm not sure in which room does he live . I'm not sure 快 I'm not sure yet. I'm not sure()( 至今) I hear Mr Brown lives here,but I'm not sure( )I hear Mr Brown lives here,but I'm not sure( ).A.he lives in which room B.which room does he live in C.which room he lives in D.in which room does he live I'm not sure which hair style _____ (fit) me best. 1.I'm not sure how old are you?2.I'm not sure how old you are?which one is right?tks I'm not sure whether this is the room ______ she left her dictionary.A.where B.that C.which D.in that回答加解释. I‘m not sure which classroom ______.A.to attend lecture B.to have lecture at C.to have lecture in D.having lecture in 麻烦+explain I'm sure I am not wrong Where's Jack?—He's away to spend his holiday.He's gone either to Hangzhou or to Wuhan,but I'm not sure .A.that B.which C.where D.there为什么?sure后面 believe it or not,I'm sure that is ____ people call the six sense.A.what B.which C.why D.whenbelieve it or not,I'm sure that is ____ people call the six sense.A.what B.which C.why D.when为什么不选B 有没有I’m not too sure? NOW, I'm not sure 什么意思 为什么没有I’m not too sure?