——I’msorrythetrafficissoheavy.

——I’m sorry the traffic is so heavy.
——Does that _____ why you are so late?

A．come across

B．believe in

C．focus on

D．account for

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Shortly after the accident, two ________ police were sent to the sport to keep order .

A． dozens of

B．dozens

C．dozen

D．dozen of

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The number of people invited __________ fifty, but a number of them __________ absent for different reasons.

A． were ; was

B．was ; was

C．was ; were

D．were ; were

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____________ people in the world are sending information by E-mail every day.

A．Several million

B．Many millions

C．Several millions

D．Many million

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The discussion_______________alive when an interesting topic was brought in.

A． was coming

B．had come

C． has come

D． came

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My mind wasn’t on what he was saying so I’m afraid I________________half of it.

A． was missing

B． had missed

C． will miss

D． missed

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