If you feel tired out and unable to think clearly,that is________you have to get

题型：山东省同步题难度：来源：

If you feel tired out and unable to think clearly,that is________you have to get a rest.[     ]
A. why
B. when
C. whether
D. what

答案

举一反三

—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

题型：同步题难度：| 查看答案

Tom was playing computer games all night.________he was late for class. [ ]

A. That"s because
B. That"s why
C. It"s how
D. That"s how

题型：福建省同步题难度：| 查看答案

— 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

题型：福建省同步题难度：| 查看答案

— 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

题型：陕西省同步题难度：| 查看答案

— ________was it that David managed to get in contact with the professor?
— Oh, a friend of mine helped him.

[      ]
A. Where
B. What
C. How
D. Why

题型：同步题难度：| 查看答案