问题

____________ the dinosaurs disappeared still remains a mystery
A:whether
B:that
C:if
D:Why
B:that
C:if
D:Why
正确答案是:
同类题型
The car is ______ expensive. I don’t have ______ money to buy.
Which sport costs the most _____ training facilities, players’ personal equipment and uniforms?
––Terribly sorry but I thought this was a parkinglot.––_______. Here is your ticket.
_________ to the efforts by the headmaster, I can go back to school now.