单项选择题

Half of those books ______ best-sellers.

A. is
B. are
C. am
D. was
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单项选择题
Ten minutes ______ an hour when I’m depressed.
A. seems
B. seem
C. seemed
D. is seeming
单项选择题
Ten dollars ______ a lot of money at that time.
A. is
B. was
C. are
D. were
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