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【題目】______ the mother really doubts is______her son will join the army soon.

A.That; whatB.What; whetherC.That; whetherD.What; that

【答案】B

【解析】

考查主語從句和表語從句。句意：媽媽真正擔心的是將來她的兒子是否能參軍。主語從句______ the mother really doubts中缺少賓語，為“……的事”，故填what；表語從句her son will join the army soon.中不缺成分，意思為“是否”，故填whether，故選B。

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