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).
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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
单项选择题
Chaucer, (whose) Canterbury Tales is one of the (most extraordinary) works in English, practically created, (or) at least (made it acceptable), a new language.
A．whose
B．most extraordinary
C．or
D．made it acceptable
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