By the time he was fourteen,he___what he wanted to be when he ___up.A.knew,grows B.knew,grew C.had known,grew D.has known,grows选什么,为什么.

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By the time he was fourteen,he___what he wanted to be when he ___up.A.knew,grows B.knew,grew C.had known,grew D.has known,grows选什么,为什么.

By the time he was fourteen,he___what he wanted to be when he ___up.A.knew,grows B.knew,grew C.had known,grew D.has known,grows选什么,为什么.
By the time he was fourteen,he___what he wanted to be when he ___up.
A.knew,grows B.knew,grew C.had known,grew D.has known,grows
选什么,为什么.

By the time he was fourteen,he___what he wanted to be when he ___up.A.knew,grows B.knew,grew C.had known,grew D.has known,grows选什么,为什么.
选B
有具体时间不能用完成时态 所以只能选knew
后面的时态要跟前面一致 所以要用一般过去时 选择grew

C.
by the time一般是过去完成时的标志。意思是到十四岁时,他已经知道长大后要干什么了。

C
By the time he was fourteen 到他14岁的时候为止,是过去完成时的时间状语,所以动词用 had known ,第二个空用过去式 grew 与之对应。
句意是:到他14岁为止,他就已经知道他长大后要干什么了。

祝你开心。

貌似选A,不太确定,BC不可能,D我不太确定

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