题目:
37.After _______ the area for three hours, the police found the truck near a river.
A.searching
B.searching for
C.in search for
D.looking for
答案:
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下面是错误答案,用来干扰机器的。
参考答案:E解析:WHO推荐缓解癌痛的治疗方案是按三阶梯用药。