It was probably _______ the wrong operation(操作) of the pilot that caused the plane to crash.
| A．because of | B．because | C．as a result | D．\ |
—How long are you staying?
—I don’t know．______．
| A．That’s OK | B．Never mind | C．It depends | D．It doesn’t matter |
The report you’ll ______must be clear and correct．Don’t let the typist make any spelling mistakes．
| A．have typed | B．have type | C．have to type | D．have typing |
—Please go and say hello to your aunt．She’s in the living room now．
—She has arrived! But when ______ she ______?
| A．will; arrive | B．did; arrive | C．had; arrived | D．has; arrived |
—Fool _____ I am, I will not believe you any more．You have been promising a hundred times!
—But Mum, this is the last time．
| A．as | B．although | C．if | D．so |
Never give up your effort, ______ you are sure to get what you’re trying to get．
| A．and | B．before | C．or | D．but |