A.should theory separate | B.should theory be separated |
C.theory should separate | D.theory should be separated |
A.should have failed | B.couldn’t have failed |
C.might have failed | D.shouldn’t have failed |
A.can | B.must | C.would | D.Might |
A.must | B.could | C.should | D.will |
A.walk | B.have walked | C.have been walking | D.will be walking |
A.may | B.must | C.can | D.Should |
© 2017-2019 超级试练试题库,All Rights Reserved.