单项选择题

The girl was heard ______ upstairs.

[A] to sing
B. sing
C. singing
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单项选择题
—Hello, Mary. You ______ very happy. —Yes. I am happy. My parents are coming to see me this afternoon.
[A] get [B] look [C] turn
单项选择题
—Can you come here again next Sunday evening —Sorry, I ______.
[A] can’t
B. may not
C. mustn’t
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