问题补充：
We asked the teacher to explain .
A. us the sentence
B. us of the sentence
C. the sentence to us
D. the sentence for us
答案：
A. us the sentence
B. us of the sentence
(答案→)C. the sentence to us
D. the sentence for us
解析：考查短语：向某人解释某物explain sth to sb /explain to sb sth，句意：我们请求老师把这句话解释给我们，所以选C。
