单项选择题

What is the relationship between the two speakers（）

A. Doctor and patient.
B. Headmaster and teacher.
C. Teacher and student.

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Scientists say it may be five or six years（）it is possible to test this medicine on human patients.

A. since
B. after
C. before
D. when
单项选择题
—What do you want to do next We have half an hour until the basketball game. —（）. Whatever you want to do is fine with me.

A. It just depends
B. It’s up to you
C. All right
D. Glad to hear that
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