单项选择题

The Mars having water, ________

A．so it may have life
B．and there may be life
C．there may be life
D．which may have life
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单项选择题
The old man________ traveling by air, for he had a serious heart disease.
A．didn't use to
B．hasn't used to
C．hadn't used to
D．wasn't used to
单项选择题
Those physicians and specialists ________in their fight against heart disease.
A．broke down
B．broke off
C．broke out
D．broke through
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