The country life he was used to_______greatly since the opening policy.A .changed B.has changed

The country life he was used to_______greatly since the opening policy.A .changed B.has changed
C.changing D.having changed.为什么?
英语人气:201 ℃时间:2020-05-24 07:12:03
优质解答
since 常与现在完成时连用,主语COUNTRY LIFE 是单数,故用 has changed
另外,he was used to 作定语修饰LIFE
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