Experiments of this kind____ in both the U.S. and Europe well before the Second World War.

A. have conducted B. have been conducted

C. had conducted D. had been conducted

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You may have had Chinese food in Chinese restaurants in your country.Have you noticed some differences that you may not know between Chinese and western eating?

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4.A. safe B. boring C. difficult D. funny

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I was headed out the door the other day with my two sons.We were going to drive to the local grocery store to pick up a few odds and ends that we had run out of during the week.I shut the door quickly because my dogs were already barking at being left behind in the house.We headed down the hill but when I reached into my pocket for the car keys,they weren't there.Shaking my head,I walked back up the hill and saw my keys still dangling from the hook（掛鉤）where I always hang them.

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