题型：单选题题类：常考题难易度：普通

——What's your question?
——I want to know _________.

A、how can trees help us B、how do trees help us C、how trees help us D、how can we help trees

举一反三

- Tomorrow morning.

—At a robot shop.

It depends on {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} today.

—Once a month.

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