Turn off the water while you ________ your teeth or washing your hands.
A．were brushingB．brush
C．a(chǎn)re brushingD．brushed
C

試題分析：句意：當(dāng)你刷牙或者洗手時(shí)關(guān)掉水管。while引導(dǎo)的從句中常用進(jìn)行時(shí)態(tài)。當(dāng)主句描述將來動作時(shí)，條件從句中常用現(xiàn)在時(shí)態(tài)，故選C。
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