The children ____ very quiet；I wonder what they ____ up to. A．were； are being B．are being；are C．are...
2023-02-01 12:58:37 15次 2010届三轮回扣语法专项训练（动词时态和语态） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The children ____ very quiet；I wonder what they ____ up to.
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A．were；
are being
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B．are being；are
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C．are；do
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D．are being；do
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