The United States __ found in 1776.美国成立于1776年。
A. was
B. were
C. is
D. are
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Ten minutes___ enough.
A. is
B. are
Two times three ___ six.二乘三等于六。
A. makes
B. make
C. are
D. were
Every man and every woman ___ busy at working.
A. is
B. are
Neither of us__been abroad.
A. has
B. have
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