问题补充:
It’s no longer a question now man can land on the moon.
A. that
B. which
C. whether
D. what
答案:
(答案→)A. that
B. which
C. whether
D. what
解析:考察主语从句。It是形式主语,真正的主语是后面的从句that man can land on the moon,that在句中起连接作用,没有实际的意义。
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