_____________ is necessary __________ he trains himself before the Guangzhou Marathon.
| A．This, 不填 | B．The, 不填 | C．It, that | D．This, that |
_____________ is necessary __________ he trains himself before the Guangzhou Marathon.
| A．This, 不填 | B．The, 不填 | C．It, that | D．This, that |
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