单项选择题
The number of people invited ______ fifty, but a number of them ______ absent for different reasons.
A. were, was
B. was, were
C. was, was
D. were, were
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单项选择题
Four plus three ______ seven.
A. equals
B. equaled
C. equaling
D. to equal
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单项选择题
Half of those books ______ best-sellers.
A. is
B. are
C. am
D. was
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