单项选择题

Mary must have finished her Ph. D at Chicago University last year, ______

A. didn't she
B. mustn't she
C. haven't she
D. hasn't she
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单项选择题
This we fully understand and greatly approve; it is what education is generally meant to ______.
A. accomplish
B. complete
C. realize
D. pursue
单项选择题
This is unlikely I admit, but, ______, virtually nothing in the Known World could withstand it.
A. if it happens
B. should it happen
C. will it happen
D. if it will happen
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