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Mary had a great deal of trouble __ the rest runners.

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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
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