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- 11The next thing he saw was smoke _____form behind the house.
A.rose
B.rising
C.torise
D.risen
开始考试练习点击查看答案 - 12_______, the experiment will be successful.
A.If carefully doing
B.If it done carefully
C.If carefully done
D.If doing carefully
开始考试练习点击查看答案 - 13While watching television, __________.
A.the doorbell rang
B.the doorbell rings
C.they heard the doorbell rings
D.they heard the doorbell ring
开始考试练习点击查看答案 - 14Each button, when _______, provides a piece of beautiful music.
A.clicked
B.having clicked
C.clicking
D.being clicked
开始考试练习点击查看答案 - 15The secretary worked late into the night, ______ a long speech for the president.
A.to prepare
B.prepared
C.preparing
D.to be prepared
开始考试练习点击查看答案 - 16When the teacher came in, the students pretended _____ the text.
A.to read
B.reading
C.to have read
D.to be reading
开始考试练习点击查看答案 - 17He made up his mind to devote his life ______ the river ______ polluted.
A.to prevent; to be
B.to prevent; from being
C.to preventing; to be
D.to preventing; from being
开始考试练习点击查看答案 - 18Old Richard,_________ ill so long ,is losing his memory and needs to be attended to.
A.to be
B.being
C.having been
D.to have been
开始考试练习点击查看答案 - 19When Peter speaks in public, he always has trouble _______ the right things to say.
A.thinking of
B.to think of
C.thought of
D.think of .
开始考试练习点击查看答案 - 20—What's that noise? —There's a truck stopping outside. It's someone _____ something.
A.deliver
B.to deliver
C.delivering
D.delivered
开始考试练习点击查看答案
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