A:---you-------(think) about the problem?B:Not yet.

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A:---you-------(think) about the problem?B:Not yet.
A:---you-------(think) about the problem?B:Not yet.

A:---you-------(think) about the problem?B:Not yet.
Have thought

Have, thought

have thought

Have you thought about the problem? B:Not yet.
从"not yet "看出应用完成时,所以用have thought。
再改成问句,于是选填Have, thought.

怎么填? The workers ( are painting ) the room. have not painted