主谓一致练习1.I, who_ your friend, will try my best to help you with your English.A.am B.is C.are D.be2. The rich _ not always happy.A.are B.is C.has D.have3. Neither Tom nor Jack and I _ his students.A.are B.am C.is D.was4. Mary as well as her sisters _ Chinese in China.A. are studying B. have studied C. studies D. study