【題目】Be-fore a problem can be solved, it must be obvious __________ the problem itself is.

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

【答案】A

【解析】句意：在一個問題被解決 之前，必須弄清問題本身所在。it must be obvious __________ the problem itself is 中，it 作形式主語，__________ the problem itself is 從句 是真正的主語，從句中缺少表語，再根據(jù)引導詞的意義可知選what。

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