【題目】Nobody is sure _______ there is UFO.

A. whereB. howC. whetherD. why

【答案】C

【解析】

句意:沒(méi)有人確定是否有不明飛行物。

本題考查賓語(yǔ)從句的引導(dǎo)詞。A. where哪里;B. how如何;C. whether是否;D. why為什么。結(jié)合句意可知,不明飛行物是否存在,沒(méi)有人可以確定,故選C

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