问题
I have a tight budget for the trip, so I’m not going to fly _the airlines lower ticket prices
A:once
B:if
C:after
D:unless
B:if
C:after
D:unless
正确答案是：
同类题型
I have nothing to do but ________ my daughter in the evening.
Why not to the park with us tomorrow
30. John has recovered and _________ 3 kilos since he left hospital last month.
The first class begins _________eight o’clock ________the morning.
What happened to Tom?—He ______ his leg while playing football with his classmates