单项选择题

As we can no longer wait for the delivery of our order, we have to ___________ it.

A．postpone
B．refuse
C．delay
D．cancel

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单项选择题

— May I speak to your manager Mr. Williams at five o,clock tonight —“I'm sorry. Mr. Williams （） to a conference long before then.

A．will have gone
B．had gone
C．would have gone
D．has gone

单项选择题

Social companionship is beneficial in that （）

A．it helps strengthen our ties with relatives
B．it enables us to eliminate our faults and mistakes
C．it makes our leisure-time activities more enjoyable
D．it draws our attention away from our worries and troubles