题目

I will never know ________ whether I was encouraging or discouraging my children's interest in technical work by my example. A.in detail  B.for fear C.for sure  D.in place 答案:C [句意:我永远不能肯定地知道,自身的例子对孩子们在科技方面的兴趣是起了鼓励作用还是反作用。for sure“肯定地,确切地”。in detail“详细地”;for fear“唯恐,以免”;in place“适当地”。]
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