单项选择题
I could have done it for you if you______.
A．ask me to
B．asked me to
C．have asked me to
D．had asked me to
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单项选择题
The greatest invention of the 20th century is ______ computer.
A．/
B．the
C．a
D．an
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单项选择题
Students majoring in English ______ by that amusing teacher at that time.
A．were teaching
B．were being taught
C．have been taught
D．are being taught
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