单项选择题

If only I ______ hard in the past few months! But I didn"t work hard enough and failed the maths examination,

A．work
B．worked
C．have worked
D．had worked
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单项选择题
______ Pacific Ocean is ______ very large sea to the west of North and South America, and to the east of Asia and Australia.
A．The; a
B．A; the
C．The; the
D．A; a
单项选择题
The lady treats the boy next door well as if he ______ her own son.
A．is
B．was
C．were
D．would be
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