The children very quiet；I wonder what they up to.A. were； are beingB. are being；areC. a

发布时间：2020-08-16 07:51:00

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

网友回答

A. were； are being
(答案→)B. are being；are
C. are；do
D. are being；do
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