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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单项选择题
Little ______ what others think.
A．does he care about
B．did he care about
C．he cares about
D．he cared about
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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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