cleaned 或者 are cleaning .因为句子没有时间状语,所以可以用一般过去时态,或者用现在进行时态.意思上都讲得通.
are cleaning 后面这个句子,有are 这个现在进行时态的标志词了,所以用 cleaning 填空.
Mr Black and Miss White ___the teacher's office together(cle
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