It is doubtful______the work can be completed on time.A、ifB、whyC、thatD、whenA

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问题 It is doubtful______the work can be completed on time.

选项 A、if
B、why
C、that
D、when

答案 A

解析考查主语从句。难点在doubtful的用法。在肯定句中，doubtful之后的主语从句的引导词需使用连词whether或if.在否定句中，引导词需用that。

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