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
The early pioneers had to ______ many hardships to settle on the new land like the New World.
A. go along with
B. go back on
C. go through
D. go into
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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