1.We should learn from those___are always ready to help others. A.who B.whom C.they D.that 2.Mr. Herpin is one of the foreign experts who___in China. A.works B.is working C.are working D.has been working 3.Tom is the only one of the students who___to Shanghai. A.have gone B.have been C.has been D.had gone 4.I,___your good friend,will try my best to help you out. A.who is B.who am C.that is D.which am
