______they would support us was a problem.

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问题 ______they would support us was a problem.

选项 A、That
B、What
C、If
D、Whether

答案D

解析 分析句子结构可知,本句为主语从句。whether(是否)可以引导主语从句,位于句首,但if不可以。that可以引导主语从句,但没有词义,不符合题意;what引导主语从句时,在句中作主语或宾语,但本句不缺句子成分,所以可排除。故选D。
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