The main problem right now is ______ I have enough time.A、thatB、whetherC、ifD、

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问题 The main problem right now is ______ I have enough time.

选项 A、that
B、whether
C、if
D、which

答案 B

解析 该句是由whether引导的表语从句,例如:His first question was whether Holmes had arrived yet.(他第一个问题是福尔摩斯到了没有。)that和which与题意不符,而if不能引导表语从句。
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