Question

The teacher ______ several times, but he still didn’t understand it.

1. A.
   explained John the sentence
2. B.
   explained the sentence for John
3. C.
   explained to John the sentence
4. D.
   explained about the sentence to John

Answer 1

C
这题考查词组：explain to sb sth“向某人解释”，句意是：老师向约翰解析了几次句子，但他还是不理解。选C。