20. Unless we receive the shipment by tomorrow, we _____ the production schedule.
(A) have delayed
(B) had to delay
(C) will have to delay
(D) delay
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統計: A(7), B(7), C(34), D(1), E(0) #3895743
統計: A(7), B(7), C(34), D(1), E(0) #3895743