单项选择题

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

A. in treating
B. treating
C. for treating
D. to treat

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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
单项选择题
This reference book（）again.

A. is worth to read
B. is worthy reading
C. is worth being read
D. is worth reading
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