题目内容
(请给出正确答案)
[单选题]
The representative talks as if he ______ all about the real feeling of the audience.
A.knew
B.knows
C.has known
D.had knew
答案
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A.knew
B.knows
C.has known
D.had knew
第2题
A.uAM(t)=UCcos(ωCt+masinΩt)
B.uAM(t)=UCcos(ωCt+macosΩt)
C.uAM(t)=UC(1+macosΩt)cosωCt
D.uAM(t)=kUΩUCcosωCtcosΩt
第3题
A、doesn't it
B、won't it
C、hasn't it
D、don't they
第5题
A.aren’t you
B.shouldn’t you
C.wouldn’t you
D.don’t you
第6题
A.musn’t she
B.hasn’t she
C.wasn’t she
D.didn’t she
第9题
A.couldn’t have smiled
B.wouldn’t be smiling
C.didn’t smile
D.won’t smile
第10题
A.R(t)·F(t)=1
B.R(t)+F(t)=1
C.R(t)-F(t)=1