2. 外语
  3. We must know such symbols ______ are used to represent the chemical elements.

We must know such symbols ______ are used to represent the chemical elements.

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问题 We must know such symbols ______ are used to represent the chemical elements.
选项 A、that
B、what
C、which
D、as
答案D
解析 在"such+n.+as"或"such as+…”或"the same+…+as"或"as+adj.+a/an+n.+ as"结构中，as作关系代词，引导定语从句，as在定语从句中可以作主语、宾语或表语，如：Ultrasonic sound is such as is inaudible to human ear．超声波是一种人耳听不到的声音。
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