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单选题 For the past six months, the engineers ________ on a new bridge across the river
学科：默认课程
时间：2026-05-15 17:58:39
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题目1单选题
By the time the plane finally took off, the passengers ________ on the tarmac for almost three hoursA. have been sittingB. were sittingC. satD. had been sitting
题目2单选题
For the past two weeks, the medical team ________ round the clock to contain the outbreakA. workedB. are workingC. had workedD. have been working
题目3单选题
By next July, the scientists ________ data on the glacier for a full decadeA. will have been collectingB. collectedC. will collectD. have collected
题目4单选题
When the bell finally rang at noon, the children ________ their seats since eight o'clockA. were occupyingB. occupiedC. had been occupyingD. have been occupying
题目5单选题
Since the beginning of the semester, the choir ________ the same piece every morningA. had rehearsedB. have been rehearsingC. rehearsedD. are rehearsing
题目6单选题
By the time rescue teams reached them, the trapped miners ________ in the dark for 72 hoursA. had been waitingB. have been waitingC. had waitedD. waited
题目7单选题
For the last hour, the interns ________ coffee just to stay awake during the meetingA. drinkB. drankC. have been drinkingD. had drunk
题目8单选题
By 2028, the national library ________ rare manuscripts non-stop for a hundred yearsA. will preserveB. have preservedC. will have been preservingD. preserved
题目9单选题
When the exam was finally over, we ________ equations for four straight hoursA. had been solvingB. were solvingC. solvedD. have been solving
题目10单选题
For the past six months, the engineers ________ on a new bridge across the riverA. have been workingB. had workedC. are workingD. worked
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