问题补充：
You cannot imagine what great trouble I took your house.
A. to find
B. finding
C. found
D. having found
答案：
(答案→)A. to find
B. finding
C. found
D. having found
解析：句意：你不能相信我花费了多大的功夫才找到你的家，take trouble to do sth不辞辛苦的做某事，故选A
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