——Susan stays alone in the classroom and looks sad ——______to her?
A,Whathappens?B.Whathashappened?C.Whatishappening?D.Whatwashappening?...
A,What happens?
B.What has happened?
C.What is happening?
D.What was happening? 展开
B.What has happened?
C.What is happening?
D.What was happening? 展开
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B.现在完成时
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B
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