2019年mpacc考试英语真题——其他350

{01}The thermostat (恒温器) ________ the fact that different metals have different coefficients (系数) of expansion.
A.based on
B.is based on
C.is basing on
D.was based on
解析：
本题选B。
{02}He is looking forward to ________ her letter.
A.received
B.receive
C.receiving
D.being received
解析：
本题选C。
{03}With the help of the teacher, he ________ others.
A.kept on
B.kept up with
C.kept off
D.kept up
解析：
本题选B。