A．whatB．whichC．thatD．since

【29】A．whatB．whichC．thatD．if

【C11】A．whatB．whichC．thatD．one

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

【C3】A．whatB．to whichC．in thatD．where

It was not until 1920 ______ regular broadcast began.A、whileB、whichC、thatD、since

【C7】A．whatB．whichC．thatD．as