No one knows for certain how the first Americans arrived in _____ is now the United States.

A. which B. what C. where D. why

B

【解析】

試題分析：考查賓語從句連接詞辨析。A.哪一個；B.什么；C.在哪里；D.為什么。句意：沒有人確切地知道第一批美國人是如何到達現(xiàn)在的美國的。介詞in后跟的從句為賓語從句，賓語從句中缺少主語，故可選用連接詞what或者which在從句中充當(dāng)主語，而which通常是很多事物中的某一個，有選擇的意義。what表示“……的東西或者事情或者人或者地方等”。故選B。

考點：考查賓語從句連接詞辨析。

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