单选题：He had an accident while he ____.

题目内容：

He had an accident while he ____. A．was driving
B．drove
C．drive
D．driving

参考答案：

答案解析：

As a rule,water ____ at 100 degrees.

As a rule,water ____ at 100 degrees.A．boiling B．boil C．boils D．boiled

分类：成人英语三级题型：单选题

What ____ on Saturdays？ A．Susan usually does B．does Susan usually do C．does Sus

分类：成人英语三级题型：单选题

The pilot asked all the passengers on board to remain ________ as the plane was

分类：成人英语三级题型：单选题

某企业只生产销售一种产品，单价50元，单位变动成本30元，年固定成本300万元。预计下年销量20万件，则利润对价格的敏感系数是（）。 A．10 B．8 C．

分类：成人英语三级题型：单选题

We shall ask for samples ___ and then we can make our decision.A．to be sent B．b

分类：成人英语三级题型：单选题