Under these_________, you might agree with us that it is rather difficult for our products to put a

footing on this market.   [ ]

A. situations                      

B. cases  

C. circumstances                

D. conditions

检索职工表中工资大于800元的职工号，正确的命令是

A．SELECT职工号WHERE工资＞800

B．SELECT职工号FROM职工SET工资＞800

C．SELECT职工号FROM职工WHERE工资＞800

D．SELECT职工号FROM职工FOR工资＞800