----How unhappy your roommate looks!
----Yes，but he’s not willing to tell me what it is____ is troubling him.
| A．what | B．which | C．as | D．that |
I recognized him_________ I saw him in the crowd.
| A．now that | B．in case | C．the moment | D．if |
—Li Ming went abroad in 2000.
—No wonder. I ______ him ever since.
| A．don’t see | B．hadn’t seen | C．didn’t see | D．haven’t seen |
______ difficult the problem was, he tried his best to solve it.
| A．No matter | B．Although | C．Whatever | D．However |
It is the teacher _____taught me when I was a child _____ I’m going to visit.
| A．that, which | B．who, that | C．who, which | D．whom, that |
Nancy was very disappointed to hear the news. I wish I her about that.
| A．hadn’t told | B．didn’t tell | C．wouldn’t tell | D．can’t tell |