2. 外语
  3. Xenon has a number of applications, ______may be mentioned its use in flash lamps for high speed photography.

Xenon has a number of applications, ______may be mentioned its use in flash lamps for high speed photography.

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问题 Xenon has a number of applications, ______may be mentioned its use in flash lamps for high speed photography.
选项 A、among which
B、which
C、and which
D、each of which
答案A
解析
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