They__do well in the exam A,can be able to B. be able to C.can ab_英语解答

They__do well in the exam A,can be able to B. be able to C.can able to D.are able to

人气：499 ℃　时间：2020-01-28 01:27:26

解答

D
can和be able to都表示“能”
两者不会同时使用
要么用can,要么用be(需要根据语态和时态修改) able to
这里用are able to