单项选择题

That ______ the case, we have to make some changes in our plan.

A．is
B．was
C．being
D．has been
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单项选择题
The accident ______ downtown yesterday resulted from the driver's carelessness.
A．happening
B．happened
C．which had happened
D．which happened
单项选择题
Did you notice the ______ on the doctor's face when he heard that Kino had found the pearl of the world
A．appearance
B．expression
C．description
D．look
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