问题
选择题
I noticed him _________ the teacher’s office just now.
A．go into
B．went into
C．was going into
D．came out of
答案
答案：A
题目分析：句意：我注意到他刚才去了老师的办公室。注意到某人做过某事的短语是 notice sb do sth，注意到某人正在做某事，notice sb doing sth。故选A.
的物质的量浓度c(
，反应的平衡常数分别为
