单项选择题
The following year， a tax law for joint venture was （promulgated）.（）
A. announced
B. prolonged
C. transformed
D. upgraded
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单项选择题
Economicproblemswere（exacerbated）bythreebadharvestswiththeresultthatnationalincomeandthevolumeofforeigntradecontractedduring1960—1962.（）
A. exaggerated
B. celebrated
C. worsened
D. facilitated
