单项选择题

—How do you know that she likes singing
—I often hear her ______ after class.

A．to sing


B．sang
C．sing



D．sings
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单项选择题
People have always been（）about exactly how life on earth began.

A. curious
B. excited
C. anxious
D. careful
单项选择题
There used to be a museum in the east of the city, ______
A．didn't there


B．used to there
C．used there


D．usedn't to there
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