John can help you with the food when he ______ cleaning the tables.

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问题 John can help you with the food when he ______ cleaning the tables.

选项 A、will finish
B、finished
C、finishes

答案C

解析 句意:约翰一擦完桌子就会来帮你准备食物。本题考查的是主从句时态。由when引导的时间状语从句,如果主句是将来时、祈使句,那么从句就用一般现在时。故C正确。
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