2019年mpa考试英语真题——介词和介词短语1047

{01}This had a great _______ upon the future of both the mother and son.
A.affect
B.effect
C.effort
D.influence
解析：have an effect on/upon sth. /sb.是固定搭配，表示“对……产生影响”。
本题选B。
{02}The house was burned down. There must have been ________.
A.certain cause
B.some cause
C.certain reason
D.some reason
解析：certain cause“某个起因、原因”。
本题选B。