The task _______ by the time you come back.
A．has been completedB．will have been completedC．will completeD．has completed
B
此題考查時間狀語從句。by the time+一般現(xiàn)在時態(tài)，主句應(yīng)用將來完成時態(tài)，by the time+一般過去時態(tài)，主句應(yīng)用過去完成時態(tài)，題中by the time后面是一般現(xiàn)在時態(tài)you come back，故選B，若掌握by the time的用法，就不難了。
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