Mary had a great deal of trouble __ the rest runners.
问题描述：
Mary had a great deal of trouble __ the rest runners.
Mary had a great deal of trouble __ the rest runners.
A.coming up with
B,keeping up with
C,living up to
D,making up for
2.Some plants are very sensitive ____ the changes of the environment
A,from
B,against
c,tO
分别选什么?为什么
答
1.B
解析：come up with 提出,想出,提供,come up with ideas想出主意
keep up with 跟上,keep up with other classmates 跟上其他同学
live up to 遵守,实践(诺言等)；符合,不辜负,lives up to what his promise 遵守诺言
make up for 弥补
根据题意,Mary跟上其他跑步选手很困难.选B
2.C
解析：sensitive about/to sth 是固定用法,表示对……敏感