he boys followed the marks that they ________, until finally they found their way back to the campsite.
| A．left | B．have left |
| C．had left | D．have been left |
相关试题
Our monitor has ____ larger collection of ____ books than any other student in our class．
| A．the; 不填 | B．a; 不填 | C．a; the | D．不填;the |
________ the project, the workers have to stay there for another two months．
| A．Not completing | B．Not completed |
| C．Not having completed | D．Having not completed |
Everyone was on time for the lecture ________ Charles, who is usually ten minutes late for everything．
| A．but | B．only | C．even | D．yet |
Most of my friends will go hiking next Sunday. The rest ______ to see a new film.
| A．has | B．have | C．are | D．is |
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