题目内容
All the club members _______ the floor when they heard someone _______ for help.| A.swept; were shouting | B.swept; shouted |
| C.were sweeping; shouting | D.were sweeping; shouted |
C解析:
此题考查过去进行时的基本构成和基本用法。
此题考查过去进行时的基本构成和基本用法。
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