桪o you know they came here? 梇es. They came here by air. A. what B. how C. where D. when 题目和参考答案——青夏教育精英家教网—

题目内容

桪o you know ________ they came here?

梇es. They came here by air.

A. what

B. how

C. where

D. when

答案：B

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