I _____ know the answer at that time. [ ]A. don"t B. didn"t C. not D. d

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I _____ know the answer at that time. [ ]
A. don"t
B. didn"t
C. not
D. doesn"t

答案

举一反三

Jack and I _____ in the teachers"office an hour ago. [ ]
A. was
B. were
C. am
D. are

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He has a friend who _______ the piano very well.       [     ]
A. play
B. playing
C. plays
D. played

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_______ they be able to speak French well in 2 years?      [     ]
A. Can
B. Will
C. Are
D. Do

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How much do you want for the book? Two dollars______ enough, I think. [ ]
A. are
B. is
C. was
D. were

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One third of the students______ Young Pioneers, and the number of this_____ not change much in our class this term. [ ]
A. is, do
B. are, does
C. was, are
D. were, were

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