单项选择题

After people have learned that magnets attract things, centuries passed ______ they took note of the fact that magnets sometimes also repel things.

A．before
B．until
C．after
D．since
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单项选择题
What do you suggest I write about, then, to stand a chance next year It isn't so much ______ you write as the way ______ you write it.
A．what... that
B．what... which
C．what... how
D．which... that
单项选择题
Her husband and her eldest son had been killed______.
A．many years before
B．many years since
C．many years ago
D．many years from now
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