wind账号密码:He said he ____back before six o'clock,but he ___by now.

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A would come;didn't appear B would be;isn't appear Cwould be ;hasn't appeared
解释一下原因

C
第一句主句是SAID过去时,所以从句也要用过去时would
第二句有by now, 到现在为止,所以用现在完成时
翻译;他说他六点前会回来,但直到现在都没出现.

A 虚拟语气
於现在相反,用过去时,所以用didn't

C would be ;hasn't appeared

前半句属陈述式语句,本是 will be 的用陈述表示变成 would be;
后半句: 但他至今仍未出现 - 表现"仍然"的语态,用现在完成时.