题目内容
4．Medical workers were sent to Ya'an soon ______ the earthquake happened．（ ）| A． | after | B． | before | C． | until |
分析 地震发生后不久，医疗工作者便被派往雅安．
解答 答案：A．
根据语境推测句意是"地震发生后不久，医疗工作者便被派往雅安．"，表示"在…以后"用介词after，故选A
点评 了解每个介词的含义是做好此类题型的关键，还要从句意着手，根据句意作出解答；所以，平时的学习中要多进行积累词汇，才能很好的完成．
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