He ______ at the meeting, but his heart attack prevented him

He ______ at the meeting, but his heart attack prevented him.

A. will speak

B. is going to speak

C. had to speak

D. was going to speak

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答案D

由题意“他本来打算在会上发言，但……”可知应该用过去将来时，只有D是过去将来时的形式。

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