单选题：Bob would have helped us yesterday, but he

题目分类：英语
题目类型：单选题
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题目内容：

Bob would have helped us yesterday, but he A．was busy
B．is busy
C．had been busy
D．will be busy

参考答案：

答案解析：

The girl had hardly rung the bell__________ the door was op

The girl had hardly rung the bell__________ the door was opened suddenly, and

分类：英语题型：单选题

第54题 ________

第54题 ________

分类：英语题型：单选题

第52题 ________

第52题 ________

分类：英语题型：单选题

What is still not clear about Cremona violins?

What is still not clear about Cremona violins?A．The shape． B．The wood． C．The siz

分类：英语题型：单选题

如图2-5-19所示的电路为某同学所接的方波发生电路，试找出图中的三个错误，并改正。

如图2-5-19所示的电路为某同学所接的方波发生电路，试找出图中的三个错误，并改正。

分类：英语题型：单选题