_______ is known to us is that time is limited and precious.A．WhatB．ThatC．ItD．As

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_______ is known to us is that time is limited and precious.

A．What

B．That

C．It

D．As

答案

解析

略

举一反三

An idea occurred to her she might work out the maths problem in another way.

A．who

B．why

C．that

D．what

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that ,or one day you may come to be ashamed of what you have done.

A．Stop doing	B．If you stop doing
C．If you don’t stop doing	D．You stop doing

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Teachers should create an environment children are taught how to solve problems of learning by themselves.

A．why

B．where

C．which

D．whose

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The blues _____ a way for people to show ______ they are and ______ is in their mind.

A．is, who, what

B．is, what, who

C．are, what, who

D．are, who, what

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When they get old, some old people go to live in a nursing home with other old people _______
there are nurses to look after them.

A．although

B．that

C．where

D．unless

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