问题描述：
1i have had a tremperature[ ]i had a headache.2mr.black has lived in china[ ]five years ago.为什么
1.a.since b.for c.before d.after
2.a,before b.for c./ d.since
1.a.since b.for c.before d.after
2.a,before b.for c./ d.since
问题解答：
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