Swimming is good for our health, but ______ the same time we mustn"t forget the
题型：期中题难度：来源：
Swimming is good for our health, but ______ the same time we mustn"t forget the danger.
A. in B. at C. on D. for
答案
举一反三
Which of the following sentences is wrong?
A. When he was five, he had to look after his sister. B. At the age of fifteen years old, he left school. C. He won a gold medal at the last Olympic Games. D. The boy doesn"t play computer games anymore.