单项选择题

How can a nonscientist explain an abstract theory with such ______.

A．confidence
B．assurance
C．self-possession
D．insurance
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单项选择题
______ for quite a long time, the rivers here are all dried up.
A．There has been no rain
B．Having no rain
C．There having been no rain
D．There being no rain
单项选择题
It is ironic that a man with such a decent dress and graceful manner ______ be a gangster.
A．can
B．may
C．should
D．would
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