______earlier, I' d have told you.
| A．If I would have known it | B．Had I known it |
| C．If I knew it. | D．Should I know it |
—Jim,have you finished reading Harry Potter and Half-Blood Prince?
—No.I______ my father on the farm all day yesterday.
| A．would help | B．had helped |
| C．was helping | D．have been helping |
Many Chinese airline companies had intended to get much the business,but it______so bad.
| A．made out | B．turned out |
| C．went out | D．carried out |
—Are you glad that you came to Washington?
—Yes indeed.I______going to New York or Boston,but I’ve never regretted my decision.
| A．have considered | B．am considering |
| C．had considered | D．was considering |
I can’t______what has happened to the vegetables,for they were freshly picked this morning.
| A．draw out | B．look out |
| C．figure out | D．work out |
Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, _______the number people infected with the virus is going up sharply.
| A．when | B．that | C．which | D．where |