单项选择题
Though adults breathe twelve times a minute, breathing is so automatic ______ the average person hardly ever thinks about it.
A．and
B．that
C．for which
D．in fact
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单项选择题
His health failing, ______ in 1995.
A．Andrew Peters went on leave from the army
B．so Andrew Peters went on leave from the army
C．when the army gave Andrew Peters leave
D．the army gave Andrew Peters leave
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单项选择题
______ the difficulties of exercising, many people prefer to be on a diet to lose weight.
A．Aware of
B．Aware
C．Being aware
D．To be aware
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