问题
选择题
.—We’ll eat as soon as the meat is done.
—It has__________to cook for another five minutes.
A．still
B．yet
C．already
D．may
答案
答案：A
still一般表示原以为事情已经结束，但结果却相反。而already则表示某事已经发生了。它一般只用于陈述句与疑问句，不能用于否定句。yet表示一种期望，一般用于否定句与疑问句。
PCl3(g)＋Cl2(g)① 
H2(g)＋I2(g)② 
N2O4(g)③