定语从句
) 12.Mr. Herpin is one of the foreign experts who___in China.
A. works B. is working C. are working D .has been working
( ) 13.Tom is the only one of the students who___to Shanghai.
A. have gone B. have been C. has been D. had gone
( ) 14 I, ___your good friend, will try my best to help you out.
A. who is B. who am C. that is D. which am
参考答案:答案分别是：12 C. are working 13. has been 14.B who am 这都是定语从句。12，who代表先行词 experts，所以其谓语动词用复数 C. are working
13。who代表先行词the only one ， 所以其谓语动词用单数 C. has been
14。who代表先行词 I ，所以其谓语动词用am