单项选择题

—Do you usually take a vacation
—Yes, I like to go away（）

A. one time the year
B. once a year
C. one time in a year
D. once in a year

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—My baby has a heart trouble. —Did the doctor find it difficult（）

A. in treating
B. treating
C. for treating
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单项选择题
The teacher with a number of students（）in the classroom.

A. are
B. are talking
C. stay
D. is
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