单项选择题

I have kept that picture ______ I can see it clearly, as it always reminds me of my university days.

A. which
B. where
C. whether
D. when
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单项选择题
By the end of this semester, we surely ______ a satisfactory solution to the problem.
A. have found
B. will find
C. will have found
D. are finding
单项选择题
In this private school, a dentist ______ the pupils' teeth twice a week.
A. injures
B. instructs
C. inspects
D. informs
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