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  3. The children______very quiet; I wonder what they______up to.

The children______very quiet; I wonder what they______up to.

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问题 The children______very quiet; I wonder what they______up to.
选项 A、were; are being
B、are being; are
C、are; do
D、are being; do
答案B
解析 be用于进行时可表示一个暂时的特点或表现。What they are up to相当于What they are doing。
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