问题描述：
-Do you know Neil Armstrong?-Yes.He is the first
-Do you know Neil Armstrong?
-Yes.He is the first man _____ on the moon.
A.walk.B.walks.C.to walk.D.walked.
-Do you know Neil Armstrong?
-Yes.He is the first man _____ on the moon.
A.walk.B.walks.C.to walk.D.walked.
问题解答：
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