单选题
Helen did not go to bed early last night because she had to ______ for today's English test.
A、
stay later
B、
sat late
C、
stay up
D、
study later
【正确答案】
C
【答案解析】
[精解] 动词短语题。stay later意为呆晚一点，不一定熬夜；没有sit late这一短语；stay up熬夜之意；没有study later这一短语；因此[C]为正确的选项。
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