单项选择题

I found ______ hard to concentrate.

A．this
B．that
C．it
D．what
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单项选择题
In case of something unexpected, it is advisable to ______ your life against accident.
A．insure
B．ensure
C．assure
D．be sure
单项选择题
______ the language in the town, he found it hard to get a piece of work,
A．Not knowing
B．Not know
C．Knowing not
D．Know not
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