[ 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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I am a factor of 28. The other factor is 4. What number am I?
_______
A. 24
B. 7
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He has an informal ….. style in his lectures.
A. chatty
B. talkative
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A. had studied
B. has studied
C. have study
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Articles › View
I went to …………. work at 7 o’clock last week.
A. a
B. an
C. the
D. –