The discussion ________ alive when an interesting topic was brought in.
A. was coming
B. had come
C. has come
D. came
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Because the shop ________ , all the T-shirts are sold at half price.
A. has closed down
B. closed down
C. is closing down
D. had closed down
—You were out when I dropped in at your house.—Oh, I ________ for a friend from England at the airport.
A. was waiting
B. had waited
C. am waiting
D. has waited
He kept looking at her, wondering whether he ________ her somewhere.
A. saw
B. has seen
C. sees
D. had seen
The first use of atomic weapons was in 1945, and their power ________ increased enormously ever since.
A. is
B. was
C. has been
D. had been