____boy Steven is!Yes,by the time he was ten,he_____to do business.A.How clever;will beginB.How clever a;has begunC.What a clever;has beginD.What a clever;had begun.正确答案是C.为啥C的has begin不用改成has begun?不是.我们老师说是C.

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____boy Steven is!Yes,by the time he was ten,he_____to do business.A.How clever;will beginB.How clever a;has begunC.What a clever;has beginD.What a clever;had begun.正确答案是C.为啥C的has begin不用改成has begun?不是.我们老师说是C.

____boy Steven is!Yes,by the time he was ten,he_____to do business.A.How clever;will beginB.How clever a;has begunC.What a clever;has beginD.What a clever;had begun.正确答案是C.为啥C的has begin不用改成has begun?不是.我们老师说是C.
____boy Steven is!
Yes,by the time he was ten,he_____to do business.
A.How clever;will begin
B.How clever a;has begun
C.What a clever;has begin
D.What a clever;had begun.
正确答案是C.为啥C的has begin不用改成has begun?
不是.我们老师说是C.好像说不是完成时.但我不太理解.请高手从语法角度解题.期待中...

____boy Steven is!Yes,by the time he was ten,he_____to do business.A.How clever;will beginB.How clever a;has begunC.What a clever;has beginD.What a clever;had begun.正确答案是C.为啥C的has begin不用改成has begun?不是.我们老师说是C.
老师原话是说,是在steven十岁之后才开始做生意,而不是在十岁之前,要用过去完成时就要在过去的过去,就是十岁之前.那个begin应该是打错叻吧.追加,