I wrote a letter to John for his help during my high school years，without which I ________ the college entrance exam.
A．would fail B．would have failed
C．should fail D．must have failed
________ me what you wanted to know, I should not have wasted my time talking so much with you.
A.Had you toldB．You have told
C．You had toldD．Have you told
Every time she was in trouble, she went to him for help, as he said he ________ do anything for her.
A．should B．must
C．would D．might
—Where did you get The Frog written by Mo Yan?
—I picked it up from a bookshop online if you ________ know.
A．must B．will
C．can D．shall
When I lived with my roommates in the university, we ________ often talk into the night.
A．might B．could
C．should D．would
________ your letter, I would have set off two days ago.
A．If I could have received
B．Should I receive
C．If I received
D．Had I received
