单项选择题

The president ______ the delegation at the airport but he was taken ill last night, so the vice-president is going to instead.

A．is to meet
B．was to meet
C．has been to meet
D．was to have met
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单项选择题
Between 1897 and 1919 at least 29 motion pictures ______ in which artificial beings were portrayed.
A．had produced
B．have been produced
C．would have produced
D．had been produced
单项选择题
______ in 1636, Harvard is one of the most famous universities in the United States.
A．Being founded
B．It was founded
C．Founded
D．Founding
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