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
Many of our dreams ______ impossible in the past have come true.
A. were considered B. to be considered
C. considering
D. considered
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
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