问题
选择题
13．Many medical scientists are racing__________time to find a cure for H1N1 as soon as possible.
A．on
B．against
C．for
D．In
答案
答案：B
搜题请搜索小程序“爱下问搜题”
13．Many medical scientists are racing__________time to find a cure for H1N1 as soon as possible.
A．on
B．against
C．for
D．In
答案：B