问题补充：
What a great weight the mother felt her mind the moment she found her lost son!
A. turned off
B. brought into
C. set free
D. taken off
答案：
A. turned off
B. brought into
C. set free
(答案→)D. taken off
解析：本题考查动词短语。句意为：当她找到失踪的儿子时，顿时感觉心中如释重负。Take off 有“去除(=remove)”的含义，即felt a great weight taken off her mind,其主动式为： take a great weight off her mind. ,其他三项不符合题意。故选D.
