单选题
As no one in the small village (knew) (nothing) about medicine, Mrs. Smith, a for-mer nurse, (had to) work (as) a doctor.
A、
knew
B、
nothing
C、
had to
D、
as
【正确答案】
B
【答案解析】
改为anything。前面是否定，后面就必须用anything，用nothing就是双重否定了。
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