答案是B
你要根据上下文来看：free在这里表示“空闲”
整句话的意思是：他空闲的话,才可以去河边玩
when he was [ ] he went down to the small river
when he was [ ] he went down to the small river
A.busy
B.free
C.ill
A.busy
B.free
C.ill
英语人气：773 ℃时间：2019-11-12 03:31:40
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