It's no longer a question now man can land on the moon.A. whenB. thatC. whetherD. how

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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