.
--- It’s already 9:00 o’clock, but he hasn’t turned up yet.
--- He ______ in the traffic jam.
| A．could have caught | B．should have caught |
| C．must catch | D．would have caught |
Gun control is a subject _________Americans have argued for a long time.
| A．of which | B．with which | C．about which | D．into which |
She’ll never forget her stay there _________-she found her son who had gone missing two years before.
| A．that | B．which | C．where | D．when |
—What do you think of teaching, Bob?
—I find it fun and challenging. It is a job __________you are doing something serious but interesting.
| A．where | B．which | C．when | D．that |
Whenever I met her, ________was fairly often, she greeted me with a sweet smile.
| A．who | B．which | C．when | D．that |
__________ team wins on Saturday will go through to the national championships.
| A．No matter what | B．No matter which | C．Whatever | D．Whichever |