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- 21When flint _____ to the market, these products enjoyed great success.
A.introducing
B.introduced
C.introduce
D.being introduced
开始考试练习点击查看答案 - 22Please remain _____; the winner of the prize will be announced soon.
A.seating
B.seated
C.to seat
D.to be seated
开始考试练习点击查看答案 - 23Don't use words, expressions, or phrases ______ only to people with specific knowledge.
A.being known
B.having been known
C.to be known
D.known
开始考试练习点击查看答案 - 24_____ to give up smoking, he threw away all his remaining cigarettes.
A.Determine
B.To determine
C.Determined
D.Being determined
开始考试练习点击查看答案 - 25The supermarket, _____ last year, is very popular.
A.open
B.opened
C.opening
D.having opened
开始考试练习点击查看答案 - 26The trees _____ in the storm have been moved off the road.
A.being blown down
B.blown down
C.blowing down D to blow down
开始考试练习点击查看答案 - 27______ to go out alone, the retired minister had to go for a walk with several policemen following him.
A.Warning not
B.Warned not
C.Not warning
D.Not warned
开始考试练习点击查看答案 - 28To tell you the truth, the film _____ on the book by Jack London is not good at all.
A.basing
B.is based
C.is basing
D.based
开始考试练习点击查看答案 - 29When a tomb is opened, fresh air disturbs the viruses. If _____, they can result in illness or even death.
A.breathe in
B.to be breathed in
C.breathing in
D.breathed in
开始考试练习点击查看答案 - 30They usually have the medicine ______ before putting into the market all over the country.
A.testing out
B.to be tested out
C.being tested out
D.tested out
开始考试练习点击查看答案
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