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