单项选择题

There is no universally (accepted) definition of (what) a developing country is. Neither (there is) (one of) what constitutes the process of economic development.

A．accepted
B．what
C．there is
D．one of
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单项选择题
Most of the changes (occurred) in pattens of family planning (had taken place) before public family services were established and at (considerable) emotional and physical costs (to many couples).
Most of the changes (occurred) in pattens of family planning (had taken place) before public family services were established and at (considerable) emotional and physical costs (to many couples).
单项选择题
(By the 1980s) more than (two-fifth of) U.S. crop production was exported, (making) U.S. agriculture heavily (dependent) upon international markets.
A．By the 1980s
B．two-fifth of
C．making
D．dependent
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