单项选择题

Writing is a slow process, requiring ______ thought, time, and effort.

A．significant
B．enormous
C．considerable
D．numerous
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I saw a traffic ______ this morning.
A．accident
B．event
C．conflict
D．damage
单项选择题
We ______our breakfast when an old man came to the door.
A．just have had
B．have just had
C．just had
D．had just had
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