题目内容
(请给出正确答案)
[单选题]
Mrs.White _____ in this school since she came here.
A.teaches
B.taught
C.has taught
D.had taught
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A.teaches
B.taught
C.has taught
D.had taught
A.uAM(t)=UCcos(ωCt+masinΩt)
B.uAM(t)=UCcos(ωCt+macosΩt)
C.uAM(t)=UC(1+macosΩt)cosωCt
D.uAM(t)=kUΩUCcosωCtcosΩt
A.couldn’t
B.needn’t
C.wouldn’t
D.mustn’t
A.(T*F)
B.T*F
C.P↑
D.P↑(T*F)
B.isn't decided
C.hasn't decided
D.doesn't decide
A.aren’t you
B.shouldn’t you
C.wouldn’t you
D.don’t you
A. doesn’t live
B. don’t live
C. doesn’t lives
D. don’t lives