_______ in the jungle, the explorer had little hope to find his way out.
| A．Leaving | B．To be left |
| C．Having left | D．Having been left |
Knowledge from real life isn't easier to forget thanachieved from textbooks.
| A．one | B．it |
| C．that | D．those |
By 16：30，was almost closing time, all the paintings had been sold out．
| A．which | B．when |
| C．what | D．that |
—I’m disappointed the experiment turned out to be complete failure again．
—Don’t lose heart．Try third time．
| A．the；a | B．a；the |
| C．a；a | D．不填；the |
We’re leaving the seaside city for home. Do you have any sea products here?
| A．to buy | B．bought |
| C．to be bought | D．buying |
It was the hotel waiter that helped the guest be relieved of her pain with his special medical skill. Without his help, she so quickly.
| A．can’t recover | B．mustn’t have recovered |
| C．couldn’t have recovered | D．couldn’t recover |