64. It's important to ask a lot of questions to keep a conversation going.
A. To keep a conversation going, it's unnecessary to ask a lot of questions.
B. To keep a conversation going, it's useless to ask a lot of questions.
C. To keep a conversation going, it's very necessary to ask a lot of questions.
D. To keep a conversation going, it's a waste of time to ask a lot of questions.
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