(2013·天津新华中学二次月考)________ several times,he still couldn't understand how to operate the machine.
#89556
A
Telling
B
Having told
C
To be told  
D
Having been told
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Attracted
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Not having received
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He formed a good habit from his childhood, ________ a lot of useful knowledge.
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remember
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to remember
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Having not read
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Not having read
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