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。