As we all know, planting trees is good for the environment. Our class will go to the Sun Island tomorrow. As soon as we there, we’ll begin to plant treesA.arrivedB.arriveC.will arrive
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B解析考查状语从句的时态。在as soon as引导的时间状语从句中，如果主句和从句的动作都发生在将来，从句用一般现在时表示将来，句意：我们一到那儿，我们就开始植树。故选B