1 . ________ he seen you yesterday, he _____________ your book.

A．Has; will have returned	B．Had; will have returned
C．Had; would have returned	D．Has; would have returned

2 . Had you come here earlier, you would have seen him. (英译汉）

3 . It seems that we have to accept the result and make a good preparation to have another try.
                      earlier, I could have done something to avoid this accident. (inform)
看来我们必须接受这个结果并做好再次尝试的准备了。要是我早点得知的话，就可以做些什么来避免这场事故了。

4 . ______ the truth, he wouldn't have helped her at all.

A．Should Bob know	B．Had Bob known
C．Were Bob to know	D．Have Bob known

5 . I couldn't have made great progress in English__________for your help.

A．had it not been

B．should it not be

C．did it not been

D．were it not

6 . Had those customers___（预定） in advance， they wouldn't be standing in line now. （根据中文提示填空）

7 . ____fired, your health care and other benefits would not be immediately cut off.

A．Would you be

B．Should you be

C．Could you be

D．Might you be

8 . She said she would have sent a car for me ________ that I was arriving today.

A．if it didn’t slip her mind

B．if it weren’t to slip her mind

C．had it not slipped her mind

D．shouldn’t it slipped her mind

9 . I didn’t know he was in the company. _______it, I_______then.

A．Had I known; would call on him

B．Should I know; would have called on him

C．If I knew; would call on him

D．Had I known; would have called on him

10 . What a relief! We would be still waiting anxiously in the classroom _______to bring an umbrella with you.

A．should you forget	B．had you forgotten
C．you should forget	D．you had forgotten