They sang in the park.They were happy.(合并为一句)They ____ _____ ______ in the park.

They sang in the park.They were happy.(合并为一句)They ____ _____ ______ in the park.
英语人气:778 ℃时间:2019-08-20 23:37:42
优质解答
They were singing happily (副词修饰形容词happy) in the park.为什么要说singingwere是be动词were的过去式,be动词后面的动词应该用ing形式。
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