_____ some mammals came to live in the sea is not known.     

试卷相关题目

• 1Don't answer me with a simple 'yes' or 'no'. Explain ______ possible.

  A.whoever

  B.whenever

  C.however

  D.whatever

  开始考试点击查看答案
• 2— ____ do you study for a test? — I study by listening to tapes

  A.What

  B.Why

  C.How

  D.When

  开始考试点击查看答案
• 3Life is ten percent what happens to you and ninety percent _____ you respond to it.

  A.that

  B.whether

  C.how

  D.what

  开始考试点击查看答案
• 4No matter how far you may fly, never forget _____ you come from.

  A.when

  B.how

  C.where

  D.what

  开始考试点击查看答案
• 5The last time we had great fun was________ we were visiting the Water Park.                                       

  A.where

  B.how

  C.when

  D.why

  开始考试点击查看答案
• 6— I rang you at about nine,but there was no reply.— Oh,that was probably________I was seeing the doctor.

  A.why

  B.when

  C.what

  D.that

  开始考试点击查看答案
• 7—It is so dark tonight, Mum.— Yes, this is just ________ we can enjoy brilliant stars in the sky.[    ]

  A.when

  B.where

  C.how

  D.because

  开始考试点击查看答案
• 8— Have you finished the book?— No, I've read up to ________ the children discover the secret cave.

  A.which

  B.what

  C.that

  D.where

  开始考试点击查看答案
• 9-I'll ask the teacher about the attributive clause. I'm very puzzled about it.-That's just ________ most of our classmates have doubt.

  A.what

  B.why

  C.where

  D.how

  开始考试点击查看答案
• 10We all know for sure ____ different life today is from that of the past.

  A.how

  B.how a

  C.what

  D.what a

  开始考试点击查看答案