It was not until the subprime loan crisis(次贷危机) ____ great damage to the American financial system that Americans ____ the severity of the situation.
| A．caused, realized | B．had caused, realized |
| C．caused, had realized | D．was causing, had realized |
—— What were you up to when your parents came in?
—— I＿＿＿＿＿for a while and＿＿＿＿＿some reading.
| A．was playing； was going to do | B．played； did |
| C．had played； was going to do | D．had played； did |
.I want to buy that kind of cloth because I ＿＿＿＿＿ the cloth ＿＿＿＿ well.
| A．have told； washes | B．have been told； washes |
| C．was told； washed | D．have been told； is washed |
—— Remember the first time we met, Jim?
—— Of course I do.You ＿＿＿＿＿ in the library.
| A．were reading | B．had read |
| C．have read | D．read |
.The vegetables didn’t taste very good.They＿＿＿＿too long.
| A．had been cooked | B．were cooked |
| C．had cooked | D．cooked |
—— Was the driving pleasant when you went to Mexico last summer?
—— No, it ＿＿＿＿ for four days when we arrived, so the roads were very muddy.
| A．was raining | B．had been raining |
| C．would be raining | D．rained |