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问题: 高手帮助一下

283.___ crops will be produced next year is not yet decided.
a.it b. what c. that d. which为什么选C,我觉得都行?详细解释 各答案翻译?


284.90% of the debts ___ so far.
a.is paid back b. have been paid off c.has been paid off d. are paid off为什么选C,不是B?我觉得都行?详细解释 各答案

解答:

283.Crops will be produced next year.是整个句子做主语,叫作主语从句。主语从句的引导词(这里是that)在句中不能省略
it不能引导从句 what做宾语 从句中各成分已经很完整了 which不通

284.因为有so far到目前为止 要用现在完成时
再因为debt是不可能名词 用has 不用have