【題目】_______relevant departments stressed no plastic covers were used for books, I didn't realize these covers contained harmful chemicals.

A.UntilB.UnlessC.WhileD.Since

【答案】A

【解析】

考查連詞。句意：直到相關(guān)部門強(qiáng)調(diào)書不能使用塑料封面，我才意識(shí)到這些塑料封面含有有害的化學(xué)物質(zhì)。A. Until直到；B. Unless 除非；C. While盡管；D. Since自從。分析句子可知，此處考查固定句型not…until…“直到……才……”，故選A項(xiàng)。

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