单项选择题

A cold is nothing to you ________ it is merely a cold; but it sometimes becomes a danger.

A．so long as
B．even though
C．no matter when
D．unless
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单项选择题
It was because of his laziness ________ he failed the final exam.
A．so
B．that
C．so that
D．therefore
单项选择题
It was noisy outside and he tried to make himself ________, but he couldn’t.
A．hear
B．heard
C．hearing
D．be heard
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