单项选择题

He ________ on the essay for an hour but so far has written only a hundred words.

A．worked
B．has been working
C．works
D．is working
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单项选择题
You can find ________ in the book on baby care.
A．many advice
B．some advices
C．a lot of advices
D．lots of advice
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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