单项选择题

21（）

A．started
B．been started
C．starting
D．being started

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______ your help we were successful.
A．According to
B．But for
C．Owing to
D．As for
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Mary has just called and asked ______ to have lunch with her tomorrow.
A．you and I
B．you and me
C．I and you
D．me and you
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