问题
选择题
His coming adds to the difficulty we ____ the problem
A．have to solve
B．have solve
C．have solved
D．have solving
答案
答案：D
搜题请搜索小程序“爱下问搜题”
His coming adds to the difficulty we ____ the problem
A．have to solve
B．have solve
C．have solved
D．have solving
答案：D