题目内容：
请在（47）处填上最佳答案。
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单选题：请在（47）处填上最佳答案。
- 题目分类：卫生类
- 题目类型：单选题
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Treatmentforcancer mayalsobring aboutsome＿＿
Treatmentforcancer mayalsobring aboutsome＿＿
Participants in the trials were happy when they were stopped
Participants in the trials were happy when they were stopped early．
John was irritated by the necessity for polite conversation.
John was irritated by the necessity for polite conversation.
The ice is not thick enough to bear the weight of a tank.
The ice is not thick enough to bear the weight of a tank.
Please do not hesitate to call me if I can be of further ass
Please do not hesitate to call me if I can be of further assistance.