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问题: 英语新概念第二册一道练习题

I asked her ______ she was enjoying her dinner.
A weather B in case C if D unless

解答:

I asked her ___A___ she was enjoying her dinner.
A weather B in case C if D unless
whether引导的从句常可以与连词or或or not直接连用,而if一般不能。
当宾语从句提到句首时,只能用whether引导,而不能用if。
whether可引导带to的不定式,if则不能。
whether及其引导的成分可放介词之后,作介词的宾语,但if不能。
whether可以引导从句,作主语、表语或同位语,而if不能。

参考文献:英语空间