[ Passive and Active Voice ]
They built this temple 3,000 years ago. This must ________ a great civilization.
a. have been
b. was
c. not have been
d. has been
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A. The
B. A
C. X
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Peter works hard at everything he does. His brother, _____, seldom puts out much effort.
A. on the other hand
B. otherwise
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A. had studied
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I went to …………. work at 7 o’clock last week.
A. a
B. an
C. the
D. –