单项选择题

In vain ______ to get in touch with the Embassy.

A．they tried
B．tried they
C．did they try
D．they have tried
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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
If reading is to accomplish anything more than ______ time, it must be active.
A．wasting
B．spending
C．passing
D．idling
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