单项选择题

When workers are organized in trade unions, employers find it hard to lay them ______.

A.off
B.aside
C.out
D.down
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单项选择题
The vocabulary and grammatical differences between British and American English are so trivial and few as hardly
A.noticed
B.to be noticed
C.being noticed
D.to notice
单项选择题
Just as the value of a telephone network increases with each new phone ______ to the system, so does the value of a computer system increase with each program that turns out.
A.adding
B.to have added
C.to add
D.added
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