题目内容
Some researchers believe that there is no doubt _________ laughter is good for health.
- A.which
- B.that
- C.what
- D.whether
B
解析:
there is no doubt属确定的语气,后面要接that引导的同位语从句。
解析:
there is no doubt属确定的语气,后面要接that引导的同位语从句。
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