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
There are lots of trees ______ the river.
A. in either side of

B. in either sides of
C. on either sides of

D. on either side of
单项选择题
I broke my relationship with him because he always found ______with me.
A. mistake
B. failure
C. error
D. fault
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