单项选择题

The fireman managed to ______ the fire in time.

A.extinguish
B.prevent
C.stop
D.ruin
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单项选择题
Before the first non-stop flight made in 1949, it ______ necessary for all planes to land for refueling.
A.would be
B.has been
C.had been
D.would have been
单项选择题
Every four years, athletes from all over the world compete in the Olympics. Each country sends teams of its best athletes to ______ the games.
A.enter in
B.go into
C.take part
D.participate in
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