(2013·天津新华中学二次月考)________ several times，he still couldn't understand how to operate the machine.
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A
Telling
B
Having told
C
To be told
D
Having been told
推荐题目
. The library’s study room is full of students _______ for the exam.
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A
usily prepared
B
usy preparing
C
usily prepare
D
re busily preparing
To my surprise, he turned up in the room without ___.
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A
noticed
B
being noticed
C
noticing
D
to be noticed
The iphone 4s, ________ by Apple, sells well across the world.
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A
produce
B
produced
C
producing
D
to produce
I rushed home in a hurry only _________ that nobody was in.
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A
to find
B
finding
C
found
D
having found