I _____ to cook now.[ ] A. have not B. d_爱下问搜题

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问题选择题

I _____ to cook now. [ ]

A. have not

B. don't have

C. had not

D. didn't' have

答案

B

单项选择题

SQL语句中，DISTINCT短语的功能是（）。

A．．DBF和．DCT

B．．DBC和．DCT

C．．DBC和．DCX

D．．DBC和．DBF

判断题

油脂在碱性条件下的水解称为皂化反应。