All the preparations for the task ________，and we're ready to start.
A．completedB．complete
C．had been completedD．have been completed
D

現(xiàn)在完成時表示過去做的事對現(xiàn)在的影響。從and we're ready to start句意可知，一切準(zhǔn)備工作已經(jīng)就續(xù)，可以開始工作了。complete是及物動詞，與句子的主語是被動關(guān)系，所以需要用被動語態(tài)表達。
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