We’d say that never before 
so moving a film as After Shock.
| A．we had seen | B．had we seen | C．we have seen | D．have we seen |
—Hi, Li Xiaoxia. What a surprise! Dad _____ you _______ so early. He’s upstairs reading. I’ll just call him.
| A．didn’t know; would come | B．doesn’t know; are coming |
| C．hadn’t known; were coming | D．hasn’t known; will come |
—Where is Lu Wenjie? 
—I have no idea．He__________ be in the library.
| A．can | B．must | C．might | D．shall |
. — You must obey every word of mine!
— _____ I don’t?
| A．How if | B．What if | C．Even if | D．Only if |
16. The river,______the bank are covered with trees, is very long.
| A．whose | B．which | C．of which | D．which of |
While building a tunnel through the mountain, ________ .
| A．an underground lake was discovered |
| B．there was an underground lake discovered |
| C．a lake was discovered underground |
| D．the workers discovered an underground lake |