单项选择题

61（）

A．if
B．and
C．but
D．since

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Busy ______ he is, he can fulfill the task ahead of schedule.
A．because
B．as
C．no matter how
D．although
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There was a terrible ______ as the crowd waited to hear who had been killed in the accident.
A．impression
B．diffusion
C．tension
D．stimulation
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