选B,因为这个句子的意思是说他们经常在夏天的时候去这条河里游泳,说明这基本上是一个每年夏天都会发生的行为,所以表示每年的夏天这种含义的时候,要使用零冠词,即in summer;
还有一种情况会用到in the summer,但是这种情况下summer后面必然有修饰成分,以说明到底是哪一个夏天,如in the summer of 1983,所以不会出现in the summer单独使用的情况.
They often go swimming in this river in（）summer
They often go swimming in this river in（）summer
A.a B./ c.the d.an
A.a B./ c.the d.an
英语人气：955 ℃时间：2020-01-26 06:34:48
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