The child ______ a week ago hasn't yet been found.

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The child ______ a week ago hasn't yet been found.
A．loses B．losing C．lost D．was lost
为什么选C D为什么不可以?

主句是 the child ... hasn't yet been found
lost a week ago 是分词做 child 的后置定语,可以认为是省略了 who was 的定语从句（the child who was lost a week ago）,因此要选C.
不选 D 的理由是在一个句子中,除非是并列关系,否则不能同时有两个谓语,选D的话就变成一个句子有 was lost 和 hasn't been found 两个谓语了.如果在 hasn't 前加一个 and 变成并列的关系,就应该选D,句子为：
The child was lost a week ago and hasn't yet been found.

The child ______ a week ago hasn't yet been found. ( )22.The doctor___for yet.A.isn’t sent B.hasn’t been sent C Mrs.williams hasn't been to the butcher's yet. 词组辨析,-Helen hasn't been at school for a whole week.-Yes.The he hasn't been caught yet 英反意疑问句的问题when they will start hasn't been decided yet,______ It ___for a week,and now it hasn't stopped yet.A、has rainedB Mrs.Green __her purse.She hasn't found it yet.A.has lost B.l 谁能帮我讲解一下这句话 The doctor hasn't been sent for yet If we shall have a meeting hasn't been decided yet 改错 The train hasn't arrived yet We have been waiting____us,but he hasn't come yet.