—Did you attend David’s wedding last night?
—No. I ________ before that.
| A．wouldn’t have been invited | B．didn’t invite |
| C．wouldn’t invite | D．hadn’t been invited |
—What do you do, Rita？
—I’m a clerk in a foreign company now．But I _____ English in a high school for 10 years．
| A．teach | B．have taught |
| C．taught | D．am teaching |
—How are you getting along with your German, Kate？
—Oh, Mr．Black, I’m so tired of it．Maybe I should drop out _____ it kills me．
| A．when | B．after | C．while | D．before |
A public health campaign _____ the number of heart disease deaths by 80 percent over the past three decades．
| A．had reduced | B．had been reduced |
| C．has reduced | D．has been reduced |
If it _____ earlier, the printing machine would not have broken down．
| A．has been repaired | B．is repaired |
| C．had been repaired | D．was repaired |
—Congratulations！I hear you’ve won the first prize in the singing competition．—You _____ be mistaken．I’m in the dance class．
| A．must | B．may | C．should | D．could |