Because (its pitch) cannot (easily be) altered, the oboe serves as the standard (which by) the symphony orchestra (is tuned).

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问题 Because (its pitch) cannot (easily be) altered, the oboe serves as the standard (which by) the symphony orchestra (is tuned).

选项 A、its pitch
B、easily
C、which by
D、is tuned

答案C

解析
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