问题
选择题
The poor boy is in danger. We should do all we _____ help him out.
A．can do
B．can to
C．can to do
D．can
答案
答案：B
这是一个常见结构，补充完整就是：We should do all we can do to help him out。
搜题请搜索小程序“爱下问搜题”
The poor boy is in danger. We should do all we _____ help him out.
A．can do
B．can to
C．can to do
D．can
答案：B
这是一个常见结构，补充完整就是：We should do all we can do to help him out。