He ( ) deal with the problem without the help for his father
题目
He ( ) deal with the problem without the help for his father
A.cans B.can C.be able to D.able（选哪个,为什么?）
答案
正确：B
can是个情态动词,没有人称和数的变化,故A是错误的.
can常与be able to互换,但can只有can/could两者形式,而be able to 则有am/is/are/was/were/will be able to等多种形式,即应该把C改为is able to,则是正确的.
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