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
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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
单项选择题
The passage is mainly concerned with ______ .
A．classification of nonverbal communication
B．the reasons why people should think about space
C．the relationship between communication and space
D．cultural aspects of nonverbal communication
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