—Half the class _____. They are very happy. —Let's join them.

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1. —Half the class _____. They are very happy.
—Let's join them.

A . is sing B . is singing C . are singing D . sings

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牛津版（深圳·广州）版初中英语2020年暑期七升八年级衔接训练——现在进行时3