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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单项选择题
I found ______ hard to concentrate.
A. this
B. that
C. it
D. what
单项选择题
The scientist Galileo claimed that the earth ______ around the sun.
A. moves
B. moved
C. is moving
D. was moving
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