单项选择题

She ______ some English before she ______ to our school.

A． learned; came
B． had learned; came
C． had learned; had came
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单项选择题
The population of Shanghai is ______ than that of Shijiazhuang.
A． smaller
B． larger
C． less
单项选择题
--This is ______ useful book, I think.-- So it is, and it's ______ unusual one.
A． a; a
B． a; an
C． an; an
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