Question

4. (2015 江苏南通，12, ★★ ★) This sign is used 

tourists to stay away from the lion in the zoo.

   A. to warn   B. to warning

    C. to make   D. to making

Answer 1

4. A

4. A句意:这个标志被用远离动物园里面的狮子3 be used to do sth.意为“被用来做某事”；warn sb. to do sth.意为 “警告某人做某事 故选A.