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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The bedroom is in perfect condition, （） a few scratches on the wall.

A. except
B. excepting
C. except for
D. except that
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No sooner （） the news than they rushed out into the street.

A. they heard
B. they had hear
C. did they hear
D. had they heard
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