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Sex education is a sensitive area for some parents, and thus it should remain _________.
A．randomB．previousC．optionalD．vital
C
考察形容詞辨析。Random隨機的 previous 之前的 optional 可選擇的 vital重要的
句意為性教育對于一些家長來說是一個敏感區(qū)域，因此它應當是可選擇的。
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