2. 外语
  3. She doesn’t know ______ she should go with him.

She doesn’t know ______ she should go with him.

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问题 She doesn’t know ______ she should go with him.
选项 A、if or not
B、whether or not
C、if not
D、whether not
答案B
解析 whether和if都可以引导名词性从句，含有“是否”的含义，但区别有三：其一，whether可以放在句首引导主语从句，让不能；其二，whether可以与or not连用，让不能；其三，whether可以放在介词后引导宾语从句，if不能。
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