【C12】A．theB．aC．anD．／

【C12】A．by or largeB．by and againC．by and largeD．by and by

【C12】A．all at onceB．once moreC．by and largeD．by and by

I went to _____ bed to pick up some papers on it.A、theB、aC、 ／D、an

A hinge joint is _____ permits forward and backward movement of a door.A:theB:whoseC:wh

【C6】A．theB．aC．xD．an

【C12】A．onceB．beforeC．becauseD．and