Oh, you are here. I _______ you came back.

A. don't know                             B. didn't know

C. haven't known                          D. won't know


【答案】B

【解析】考查動詞時態(tài)的用法。根據(jù)句意：“哦，你在這里，我不知道你回來了”，顯然現(xiàn)在已經(jīng)知道了，所以要用過去時，表示“原來”不知道，所以選擇答案B。


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