A．whatB．at whichC．whereD．in which

A.in whichB.at whichC.from whichD.on which

In fact he had done ______ he could do to help the poor.A．whatB．whichC．asD．all which

【C10】A．whatB．whichC．whereD．how

China has many islands, ____ the largest is Taiwan.A、in whichB、at whichC、of which

There are many animals, however, ____ never play.A: whatB: whichC: thatD: where

【C3】A．whatB．to whichC．in thatD．where