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For a long time, he hesitated whether he should tell us ____ what had happened.
A．a(chǎn)t duskB．a(chǎn)t lengthC．a(chǎn)t presentD．a(chǎn)t stake
B
考查短語(yǔ)辨析。at dusk在黃昏，at length最后，詳盡地，at present現(xiàn)在，at stake生死攸關(guān)，句意：很長(zhǎng)一段時(shí)間，他猶豫是否他應(yīng)該詳盡地告訴我們所發(fā)生的事。故選B。
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