题目内容

Sex education is a sensitive area for some parents, and thus it should remain _________.
A．randomB．previousC．optionalD．vital
C
考察形容词辨析。Random随机的 previous 之前的 optional 可选择的 vital重要的
句意为性教育对于一些家长来说是一个敏感区域，因此它应当是可选择的。
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