问题
选择题
Up to now, they _________ a good way to solve that problem.
A．didn’t find
B．can’t find
C．hadn’t found
D．haven’t found
答案
答案：D
考查时态。Up to now，到现在为止，是现在完成时态的标志，所以选D。
搜题请搜索小程序“爱下问搜题”
Up to now, they _________ a good way to solve that problem.
A．didn’t find
B．can’t find
C．hadn’t found
D．haven’t found
答案：D
考查时态。Up to now，到现在为止，是现在完成时态的标志，所以选D。