单项选择题


A．if
B．once
C．when
D．whereas
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单项选择题
A．unlessB．onceC．whileD．as
A．unless
B．once
C．while
D．as
单项选择题
A．Deliberately.B．ConsequentlyC．FrequentlyD．Apparently
A．Deliberately.
B．Consequently
C．Frequently
D．Apparently
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