问题
选择题
____ You know. Mary is a bit slow ___ understanding so...
_____ So I have to be patient _____ him.
A．On; with
B．in; with
C．in;to
D．at;of
答案
答案：B
考查介词的用法。be a bit slow in ……,在……方面有点慢；be patient with 表示对某人有耐心。故选B。