【題目】Don't touch the instruments in the laboratory ________ the teacher allows you to do that.
A.unless B.when C.though D.because
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【題目】This is the most beautiful park I have _____ visited.
A. ever B. yet C. never D. already
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【題目】It’s necessary for you _____ exercise every day.
A.taking B.to take C.take D.takes
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