单项选择题

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

A．out
B．up
C．off
D．down
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单项选择题
Women often are swayed to buy a product for reasons far different than those that drive men.
A．fluctuated
B．shielded
C．praised
D．fulfilled
单项选择题
Linda did not have time to go to the concert last night because she was busy ______ for her experiment.
A．to prepare
B．to be prepared
C．being prepared
D．preparing
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