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【題目】 _____ it will do us harm or good remains to be seen.

A. If B. Whether C. That D. What

【答案】B

【解析】試題分析：考查主語從句辨析。句意：是有益還是有害有待于觀察。If 不引導主語從句排除A，That引導主語從句無詞義不做成分排除C，what引導主語從句時在從句中做主語或者賓語，而本句不少排除D，根據關鍵詞or和句意，故選B。

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