_______ we cannot change yesterday, we can learn lessons to face tomorrow.

A. Though B. As C. Since D. Unless

A 【解析】句意：盡管我們無法改變昨天，但是我們可以吸取教訓(xùn)來面對明天。though盡管，引導(dǎo)了讓步狀語從句；as當(dāng)……時候，引導(dǎo)時間狀語從句；since因此，引導(dǎo)原因狀語從句；unless除非，引導(dǎo)條件狀語從句。結(jié)合句意，前半句表示我們無法改變昨天，后半句表示我們可以面對明天，前后是讓步關(guān)系，故用連詞though。故選A。
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