问题标题:
Look!They__________(clean)theirclassroom.(所给词的适当形式)
问题描述:
Look!They__________(clean)theirclassroom.(所给词的适当形式)
杜蘅回答:
Look!Theyarecleaningtheirclassroom.
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Look!They__________(clean)theirclassroom.(所给词的适当形式)