--- The young man spent as much time as he _______ the experiments. --- No wonder he succeeded _______.
A.
did; by the end
B.
could doing; in the end
C.
could doing; at the end
D.
could to do; in the end
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【单选题】According to documentary credit, the( ), on receipt of letter of credit, will have to prepare shipment of the contract goods within the delivery date.