题目内容
(请给出正确答案)
[单选题]
A.couldn'tB.wouldn'tC.mustn'tD.shouldn't
A.couldn't
B.wouldn't
C.mustn't
D.shouldn't
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A.couldn't
B.wouldn't
C.mustn't
D.shouldn't
I suppose you couldn’t let me borrow your car this evening, ?
A.couldn’t I
B.don’t I
C.could you
D.will you
When a friend gave Jim a ticket to the game, he______go.
A.couldn't help
B.cannot do but
C.couldn't help but
D.just have to
You___ to the theme park yesterday, it has not been made open to the public yet.
A.couldn’t have gone
B.must have gone
C.needn’t have gone
D.should have gone
A.couldn't
B.mustn't
C.wouldn't
D.shouldn't
已知f1(t)=tε(t),f2(t)=ε(t)-ε(t-2),求y(t)=f1(t)*f2(t-1)*δ'(t-2)。