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

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It is doubtful______the work can be completed on time.

A.if

B.why

C.that

D.when

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。