问题补充：
The guards caught the spy and him very carefully.
A. searched for
B. searched
C. look for
D. asked for
答案：
A. searched for
(答案→)B. searched
C. look for
D. asked for
解析：本题大意，警卫抓住间谍，非常仔细地搜查他。A. searched for当没有“被搜的对象”只有“寻找的目标”时使用该短语B. searched作动词时，意思是“在…搜查”或“搜身”。是个及物动词，后面直接跟“被搜的对象”。C. look for 寻找 D. asked for 请求，要求
考查点：动词及短语
