问题
选择题
The children ____ very quiet；I wonder what they ____ up to.
A．were； are being
B．are being；are
C．are；do
D．are being；do
答案
答案：B
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The children ____ very quiet；I wonder what they ____ up to.
A．were； are being
B．are being；are
C．are；do
D．are being；do
答案：B