题目内容
【题目】选择be动词的适当形式填空。
am is are
1. —What ____ they doing?
—They’re exercising.
2. You______talking. I_____ listening.
3. —_____ Tony sleeping?
—No, he’s thinking.
4. The children _____ dancing.
【答案】1. are 2. are am 3. Is 4. are
【解析】
略
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