题目内容

—We’ll visit the Summer Palace_____ there is a heavy rain tomorrow.

— OK! Boating on the lake must be great fun.

A.if

B.as soon as

C.unless

D.since

 

【答案】

C

【解析】根据前后文的关系,可知答案为C,表示除非的意思,相当于if not,故选C

 

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