问题补充:
Its no longer a question now man can land on the moon.
A. when
B. that
C. whether
D. how
答案:
A. when
(答案→)B. that
C. whether
D. how
解析:考查主语从句。本题的it是形式主语,真正的主语是that man can land on the moon,that引导起这个主语从句,在句中起连接作用,没有任何实际意义。
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