单项选择题

If the whole operation ____ beforehand, a great deal of time and money would have been lost.
A、was not planned
B、has not been planned
C、were not planned
D、had not been planned

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买卖双方在合同中规定:“按提单日期的国际市场价格计算。”这是固定作价的一种规定方法。( )

答案：错误

单项选择题

为了刺激母猪发情，饲养过程中可以采用大栏饲
A、正确
B、错误