—Please go on with your demonstration．
—But where was I?
—Well, you_____the two chemicals together．
A．tried to mixB．were trying to mix
C．were trying mixedD．had tried to mix
B

根據(jù)句意是：--請(qǐng)繼續(xù)你的演示。---到哪兒啦？---你想把兩種化學(xué)物質(zhì)混合起來(lái)。說明是剛才正在做…,用過去進(jìn)行時(shí)。選B。
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