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题目
题型:不详难度:来源:
It took me a long time before I was able to fully appreciate what they ______ for me.
A.had doneB.didC.would doD.were doing

答案
A
解析
考查时态。从句的动作发生在谓语动词之前,题中谓语动词为took,“过去的过去”应用过去完成时态。故选A。
核心考点
试题【It took me a long time before I was able to fully appreciate what they ______ fo】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三
Up to now, the program ______ thousands of children who would otherwise have died.
A.would saveB.savesC.had savedD.has saved

题型:不详难度:| 查看答案
—Time       . It’s likely that we will miss the bus.
—Don’t worry. There are still 10 minutes left.
A.has run outB.has been run outC.is running outD.is being run out

题型:不详难度:| 查看答案
—I haven’t seen Tom for years. Any news about him?
—He          in a toy factory for two years. Now he’s working on a farm.
A.worksB.workedC.has workedD.had worked

题型:不详难度:| 查看答案
The black box is a necessary device on an airplane, which records its speed, direction and whether everything on the airplane______ normally.
A.will functionB.functionedC.is functioningD.has functioned

题型:不详难度:| 查看答案
—You may find the key to the math problem on page 107.
—Ah, it’s so simple. I wonder why I _____ of that.
A.hadn’t thoughtB.haven’t thoughtC.didn’t thinkD.wasn’t thinking

题型:不详难度:| 查看答案
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