______for aches, pains and fever, Aspirin is now the subject of multiple investi

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问题 ______for aches, pains and fever, Aspirin is now the subject of multiple investigations of its role in treating many more serious complaints.

选项 A、Long used
B、Being used long
C、Having been long used
D、It has long been used

答案 A

解析选项B和C，long的位置错误，正确的词序应为：B：Being long used：C：Having long been useD句子前半部分是状语，故D也不对。由此可见A是唯一可接受的选择。

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