问题
选择题
It is when the plane ______ that you’d better find out at the booking office.
A．would take off
B．had taken off
C．was taking off
D．is taking off
答案
答案：D
注意题干为强调句型。take off用进行时态表示将来。
搜题请搜索小程序“爱下问搜题”