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By the end of next year，they ________ the work on the new stadium.
A．would have completed
B．had completed
C．will have completed
D．have completed
C

考查時態(tài)。根據(jù)時間狀語“By the end of next year”可知，本句應(yīng)使用將來完成時態(tài)，表示到明年年底前他們將已經(jīng)完成新體育館的建設(shè)。
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