单项选择题

By the treaty each country pledged itself to assist the other in case of war.

A．assured
B．applied
C．obliged
D．promised
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单项选择题
Several international events in the early 1990s seem likely to go backwards, or at least weaken, the trends that emerged in the 1980s.
A．revolt
B．revolve
C．reverse
D．revive
单项选择题
In the Chinese household, grandparents and other relatives play necessary roles in raising children.
A．incapable
B．indispensable
C．insensible
D．infinite
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