单项选择题

A．His only son is dying.
B．His mother died some time ago.
C．He didn’’t look after his sick wife.
D．He hasn’’t taken good care of his son.
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单项选择题
Exposure to asbestos fibers can cause cancer _________.
A．only when asbestos is used in building industry
B．only when it is used in large quantities
C．even if it is used in small quantities
D．if they are used when wet rather than dry
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