单项选择题

If you can't solve this problem, why not try ______ help

A．to ask for
B．asking for
C．to ask
D．asking
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单项选择题
______ Mary had heard that sound was she really frightened.
A．Not when
B．Not as
C．Not until
D．Until
单项选择题
Crops grew smaller in production in South Carolina mainly because ______.
A．demand for cotton had decreased
B．crops became varied
C．planters grew richer
D．soil was less productive
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