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
He was in poor health. He could not make his voice ______.
A．hear
B．to hear
C．heard
D．to be heard
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