Years ago we didn ’t know this, but recent science ( ) that people who don ’t se ep well soon get ill.
A.showed
B.has shown
C.will show
D.is showing
All the students in Class 5 will climb the mountain if it _______ rain tomorrow.A. won’t B. don’t C. didn’t D. doesn’t
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You seem to be dissatisfied with your present post. I don’t think you judged your ability objectively when you applied for it, () you?A.doB.didC.don’tD.didn’t
We ______each other again since we graduated from the college.(A) hadn’t seen(B) didn’t see(C) don’t see(D) haven’t seen
You like playing football, () you?A、doB、didn'tC、didD、don't
--Your phone number again? I _______ quite catch it.A.don'tB.can'tC.couldn'tD.didn't
We _____ like coffee before_____ all.A.don’t … atB.didn’t … atC.didn’t … inD.don’t ...in
The house is dirty. We ()it for weeks.A、didn’t cleanB、hadn’t cleanedC、don’t cleanD、haven’t cleaned