It's no longer a question now _____ man can land on the moon.
A．whenB．thatC．whetherD．how
B
考查主語從句。本題的it是形式主語，真正的主語是that man can land on the moon,that引導(dǎo)起這個主語從句，在句中起連接作用，沒有任何實(shí)際意義。
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