—May I smoke here ?
—If you ____, choose a seat in the smoking section.
| A．should | B．could | C．may | D．must |
相关试题
－What are you busy with ?
－The conference _______ in our city next week.
| A．held | B．will be held | C．be holding | D．to be held |
Attention, coffee lovers! We have for you, the best coffee machine _____ invented.
| A．ever | B．already | C．even | D．nowadays |
Can you imagine what difficulty people had this year_______________against thesevere naturaldisasters?
| A．fighting | B．to fight | C．fought | D．fight |
―Where did you get to know her?
―It was on the farm we both once worked in the 1970s.
| A．that | B．which | C．when | D．where |
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