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__________ they invite you to speak, remain silent. A． Even though B. Though C. If D.
Businessmen make most oftheir income from profit_______by producing and selling products．
Our new sales managerfound out that_________the job done is not as easy as it first appears. A．get B．got C．gotten D．getting
The mere fact__________ most people believe nuclear war would be mad does not mean that
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