IthinkifImakeapenthathasamachi

发布时间:2020-07-09 14:06:33

I think if I make a pen that has a machine in it, I'll _____ write faster.













A.can












B.could











C.has been able











D.be able to

网友回答

D解析can和be able to 均可表示“能”,但can只有现在式和过去式(could)两种形式,而be able to则可以用于多种时态。
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