公共英语一级

单选题John can help you with the food when he __________cleaning the tables.

A．will finish
B．finished
C．finishes

参考答案：C进入在线模考
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。【知识扩展】在以when，after，as soon as等引导的时间状语从句以及以if，unless等引导的条件状语从句中，如果主句和从句都是指将来，当主句用一般将来时或祈使句，从句用一般现在时。

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