问题补充：
Old Henry hihis loves dog, but he didn’t it.
A. is looking for, find
B. looks for, found
C. looked for, find
D. looked for, found
答案：
A. is looking for, find
B. looks for, found
(答案→)C. looked for, find
D. looked for, found
解析：考查时态.句意:老亨利正在找他的狗,但是他还没有找到.结合语境可知前文描述的是现在正在进行的动作,故用现在进行时态.下文描述的是刚才寻找的结果,故用过去时态,前面已有助动词didn’t,故动词用原形.look for 强调的是寻找的过程，而find强调的是找的结果，故选C
