It is not until recently ______ the scientists have found proof of there being w

题型：不详难度：来源：

It is not until recently ______ the scientists have found proof of there being water on Mars.

A．when

B．that

C．how

D．what

答案

解析

略

举一反三

He warmly congratulated them on _____ they had achieved in science and technology.

A．that

B．where

C．what

D．which

题型：不详难度：| 查看答案

Students can easily fall behind in their studies ____ they don’t manage their spare time carefully.

A．though

B．if

C．since

D．until

题型：不详难度：| 查看答案

_____ he is very busy, he spends at least two hours every day surfing the Internet in order to find out the latest development in science and technology.

A．Even though

B．When

C．Unless

D．Whether

题型：不详难度：| 查看答案

___ she will come or not depends on her mood.

A．Whether

B．If

C．When

D．That

题型：不详难度：| 查看答案

There is nothing ___ two chairs in the room.

A．beside

B．but

C．except that

D．of

题型：不详难度：| 查看答案