单项选择题

______, he realized he made the right decision.

A．Before long
B．Long before
C．After
D．Before
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单项选择题
He was, to a certain practical extent, experienced in ______ trades and callings collateral to his own.
A．numerable
B．numerical
C．numeral
D．numerous
单项选择题
______ for a long time, the fields are all dried up.
A．There has been no rain
B．Having no rain
C．There having been no rain
D．There being no rain
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