题目内容
The 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 |
C
解析试题分析：考查时态。根据句意可知他们留下脚印是之前完成的事情，故使用过去完成时。句意：男孩们沿着他们之前留下的脚印直到他们找到回到营地的道路。故C正确。
考点：考查时态
举一反三单元同步过关卷系列答案— You were late again, Peter.
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| A．wanted; was | B．had wanted; was |
| C．wanted; would have been | D．had wanted; would have been |
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—Luckily, he was found relatively quickly and_______to the local medical center.
| A．was reminded; rushed | B．had been reminded; rushed |
| C．was reminded; rushing | D．had been reminded; rushing |
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| A．designed | B．designing | C．are designed | D．is designed |
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| A．had melted | B．has been melting | C．melted | D．is melting |
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| A．has left | B．will have left | C．had left | D．will be leaving |
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| A．serves | B．served | C．has served | D．had served |
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| A．has worn | B．was wearing | C．wears | D．is wearing |
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| A．visit | B．visited | C．have visited | D．had visited |