[单选题]Directions: In this part there is a sentence with four choices marked A, B, C and D. Choose the one that best completes the sentence.By boat is the only way to get here, which is (        ) we arrived.

A

where

B

when

C

why

D

how 

正确答案:D
题目解析

分析which引导的非限制性定语从句可知,后面为表语从句,这里用连接副词how引导表语从句,充当方式状语,表示"如何",故选D

句意:乘船是到达这里唯一的途径,这就是我们如何到达的

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