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

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They__dowellintheexamA,canbeabletoB.beabletoC.canabletoD.areabletoThey__dowellintheexamA,canbeableto

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

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

D
can和be able to不可同时使用
AC排除
be(需要根据语态和时态修改) able to放在they后面,该be为are。