It was the training _____ he had as a young man _____ made him such a good engineer.
| A．what ; that | B．that ; what | C．that ; which | D．which : that |
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It was the training _____ he had as a young man _____ made him such a good engineer.
| A．what ; that | B．that ; what | C．that ; which | D．which : that |
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