[ 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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Children under the age of 12 … to use the ski lift unless they’re with an adult.
A. won’t allow
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I went to …………. work at 7 o’clock last week.
A. a
B. an
C. the
D. –