[单选题,3.3分] By the time Jack comes back from his hometown, we _______ all the preparations. A.finish B.have finished C.had finished D.shall have finished

[单选题,3.3分] By the time Jack comes back from his hometown, we _______ all the preparations.
A.finish
B.have finished
C.had finished
D.shall have finished

出自：河南大学-大学英语（一）

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