单项选择题

Michael might have come to school in time for Professor Browning’s lecture （）

A. ff he got up earlier
B. unless he had got up earlier
C. but he had gotten up so late
D. but he got up rather late

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单项选择题
I had to get （） about the subject before I write the paper.

A. a few more informations
B. a little more information
C. a few more information
D. a little more informations
单项选择题
Economies, several courses of which I have taken thus far, （） to be difficult but useful for almost all students.

A. prove
B. proves
C. have been proved
D. are proved
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