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The story happened in _____________ .
[ ]
A. the 1980s B. 1980s C.1980's D.the 1980
________ many lucky businessmen became rich ________．
A．In the 1980s; in their twenties
B．In the 1880's; in the twenties
C．In its 1980s; in their twenty
D．In its 1980's; during their twenties
________, he went abroad．
________ Pierre began to help his father with the farm work when he was
A. In 1980's; his teens B. At the 1980's; the teens
C. In the 1980s; in his teens D. In 1980's; in the teens