单项选择题

Five minutes earlier, ______ we could have caught the last train.

A．and
B．but
C．or
D．so
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单项选择题
______ we have finished the text, we shall start doing more revision exercises.
A．For now
B．Since that
C．Now that
D．By now
单项选择题
______ have gone abroad.
A．The White
B．The Whites
C．The White's
D．The whites'
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