B
C时态不对
D语法不对
A里could用在过去时里通常想说能做但没做的事.比如与could have连用
B是陈述事实 表明他游过去了
Though he was sick,he____swim across the river.
Though he was sick,he____swim across the river.
A.could B.was able to C.can D.such like
A.could B.was able to C.can D.such like
英语人气：527 ℃时间：2019-08-20 09:12:08
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