Today many physical bookstores ________ down with financial difficulties, inflexible management strategies and competitive pressure from online bookstores.
A．had closedB．having closed
C．being closedD．a(chǎn)re closing
D
答案：D　考查動詞時態(tài)。句意為：由于死板的管理模式和網(wǎng)上書店競爭壓力，如今很多實體書店因資金問題正面臨著倒閉。根據(jù)語意及句中的時間狀語“Today”可知，此處表示“目前正在進行和發(fā)生的動作”，因此應用現(xiàn)在進行時。故答案選D。
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