I didn't know how long____ such a

来源：百度知道 编辑：UC知道 时间：2024/09/19 16:34:09
A.has he had B.he has caught C. he had had D.had he caught

C 这个句子主句有didn't 所以从句也要过去式

A B 都是现在完成时 不是过去 排除

主从复合句中 从句按陈述句语序 所以选C

D是疑问句语序

C

C. he had had

C 此句是宾语从句，主句是一般过去时，从句也要相应的用过去的某种时态。此句是how long 引导的宾语从句，从句要用陈述句语序。所以D不对，语序不对