用所给词的适当形式填空 I'm sorry,I____(not konw)you were here.

填写：didn't know

句末be动词是were，使用一般过去式

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He_____(bought)a new dictionary two weeks ago.
They ______(stay)in the park for two hours last Sunday.
Mr.Chen has come.I______(see)him at the gate.
If I_____(konw)the answer,I will tell you.

bought
stayed

saw
know

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