.--- Haven't I told you that I like the beef well done?
---Yes, but I _____ it longer than I usually do.
| A．was cooking | B．will cook | C．cooked | D．had cooked |
Scientists have discovered amazing evidence showing how the human body rebuilds _______ while we sleep.
| A．us | B．ourselves | C．it | D．itself |
—Why didn’t you remind him of the possible danger?
—But what _______ otherwise? He never listens to me.
| A．could I do | B．could I have done | C．should I do | D．must I have done |
The new means of transport ________ in this city, so whether it will work out remains to be seen.
| A．have never tried | B．has never tried | C．have never been tried | D．has never been tried |
It wasn’t until then _______ their marriage was breaking up because they had little in common.
| A．did I realize | B．that I realized | C．had I realize | D．when I realized |
The earthquake in Japan, measuring 9.0 on the Richter Scale, was so violent _______ cause a series of explosions of the nuclear reactors in several power stations.
| A．to | B．that | C．as to | D．as that |