单项选择题

Mom says she will not be back ______ next week.

A． until
B． by
C． after
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单项选择题
Alice began to learn English since 5 years ______.
A． before
B． ago
C． later
单项选择题
The question is ______ difficult that no one in the class is able to give the answer.
A． very
B． so
C． too
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