单项选择题

The football player had studied economics in the university for ______ of roughly six years.

A．a decade
B．a time
C．an age
D．a period
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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
When Pilot Office Peter Thwaites was away on business, his neighbou gave his wife ______ with the housework.
A．an aid
B．a help
C．a hand
D．a lift
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