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Bill ______ Russia for two years.

A. has left

B. left

C. has been away from

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单项选择题

The girl was heard ______ upstairs.

[A] to sing
B. sing
C. singing

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—Hello, Mary. You ______ very happy. —Yes. I am happy. My parents are coming to see me this afternoon.

[A] get [B] look [C] turn

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