问题

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
B:are being;are
C:are;do
D:are being;do
正确答案是:
同类题型
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No conclusion _______ about the new product until the result of the experiment has been announced
______ role she played in the film! No wonder she has won an Oscar.