Question

____ 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

Answer 1

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。