Father is too tired today. Don’t call him ________ it is necessary.
- A.if
- B.unless
- C.when
- D.whether
正确答案及解析
正确答案
解析
句意：爸爸今天太累了。除非有必要，否则不要给他打电话。
考查连词。A. if如果；B. unless除非；C. when什么时候；D. whether是否。根据上文Father is too tired today可知，父亲太累了，所以除非很有必要，否则不要给他打电话。B选项符合句意，故选B。
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