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
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单项选择题
Carey didn't go to the party last night because she ______ the baby for her sister until 9:30.
A．must have looked after
B．would have to look after
C．had to look after
D．should have looked after
单项选择题
The WTO is regarded by some countries as an access to foreign markets rather than as a ______ for opening up the home market.
A．commerce
B．committee
C．commitment
D．commission
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