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
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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
单项选择题
My aunt ______ me for a long time when I met her yesterday.
A．didn't see
B．hasn't seen
C．hadn't seen
D．doesn't
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