. Four-fifths of the crop ______.A．are ruinedB．was ruinedC．were ruinedD．have be

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. Four-fifths of the crop ______.

A．are ruined

B．was ruined

C．were ruined

D．have been ruined

答案

解析

略

举一反三

. Three-fourths of the buildings ______.

A．was destroyed

B．is destroyed

C．were destroyed

D．has been destroyed

题型：不详难度：| 查看答案

. Early to bed and early to rise ______ a man healthy, happy and wise.

A．making

B．to make

C．make

D．Makes

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. Mathematics ______ the language of science.

A．is

B．has been

C．are

D．have been

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. None of them ______ my friends.

A．is

B．are

C．was

D．has been

题型：不详难度：| 查看答案

. Getting to other planets or to the moon _____ many problems.

A．involve

B．involves

C．involving

D．to involve

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