问题

This more usage flexibility.
A:as
B:since
C:while
D:if
B:since
C:while
D:if
正确答案是:
同类题型
Tom’s boss gave him a long leave after the terrible accident.________, he was fired.[ ]
Lucy cut down her daily spending in order to ____the financial storm(金融风暴)
You cannot be more careful when crossing the street, or you may ___ by cars.
How did you get the news about the accident of Sewol Ship– I________by Jerry on the Internet.