2019年mpacc考试英语真题——介词和介词短语1529

{01}Jane,don"t leave things about.You should learn to put everything________.
A.out of order  
B.in order
C.in the order  
D.in orders
解析：
本题选B。

{02}We receive ten letters________each day.
[      ]
A.on average    
B.on the average
C.on an average    
D.A, B and C
解析：
本题选D。