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单项选择题

Trade unions often ______ with employers for better conditions of pay employment.

A．ask
B．require
C．bargain
D．plead

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单项选择题How long did the man wait before his call was answered

A．Twenty minutes.
B．Twelve minutes.
C．Twenty-four minutes.
D．Thirty minutes.

单项选择题How much does the extreme survival course cost per person

A．￡139.
B．￡149.
C．￡159.
D．￡169.