87. It takes 45 days to ______ the toolings and the production ______ time is 30 days. Therefore, we need a total of 75 days to execute your first order.
(A) build； lead
(B) build； leading
(C) open； lead
(D) open； leading

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統計： A(1), B(1), C(0), D(0), E(0) #2968491