2019年mpacc考试英语真题——固定短语55

{01}During the chemical experiment, he told his students to ________ what had happened to the materials．
A.search
B.find out
C.look for
D.see
解析：search, look for, see(看见)的宾语是具体的事物，而what had happened to the materials是一种状况。
本题选B。
{02}Now and then they would ________ our house and have a talk with us．
A.call on
B.drop in at
C.drop in on
D.drop in
解析：
本题选B。