问题补充：
--- Do you think Mom and Dadlate?
--- No, Swiss Air is usually on time.
A. were
B. will be
C. would be
D. have been
答案：
A. were
(答案→)B. will be
C. would be
D. have been
解析：答句中的No,是根据Swiss Air is usually on time的猜测，因此可知mon and Dad还没有回来，答句只是根据已知的信息对将要发生的事情进行的预测，因此选择B选项，一般将来时。句意为，-----你认为妈妈和爸爸会迟到吗？---不会的，瑞士航空通常都是很准时的。
【考点定位】考察时态。
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