（湖南省怀化市2014年高三第二次模拟考试）23. Mr. Smiths was busy writing a story, only ______ once in a while to smoke a cigarette.
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A
to stop
B
to have stopped
C
being stopped
D
stopping
推荐题目
There is no doubt that our educational system leaves something __________.
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A
being desired
B
to be desired
C
to desire
D
to have been desired
--- Why do you look sad?---There are so many problems ______.
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A
remaining to settle
B
remained settling
C
remaining to be settled
D
remained to be settled
________ in a long queue, we waited for the store to open to buy a New iPad .
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A
Standing
B
To stand
C
Stood
D
Stand
She smiled happily，________ a set of amazing white teeth to us.
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A
exposing
B
being exposed
C
exposed
D
to expose
Professor White has received a letter ___ to give a lecture in Peking University.
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A
to be invited
B
being invited
C
invited
D
inviting him