单项选择题


A．unless
B．once
C．while
D．as
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单项选择题
A．Deliberately.B．ConsequentlyC．FrequentlyD．Apparently
A．Deliberately.
B．Consequently
C．Frequently
D．Apparently
单项选择题
A．Even ifB．BecauseC．IfD．For
A．Even if
B．Because
C．If
D．For
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