托业考试

【单选题】PossibleBreakthrough in RenewableEnergy
Plant scientists at the University of Michigan (150) an intriguing breakthrough. They are excited about a new breed of plant that can produce very high energy yields. The plant, which is a cross-breed of corn, wheat and barley, was originally made for another (151) .
The scientists were initially trying to develop a new feed crop for cattle. While the crop was a failure as cattle feed, additional testing showed that it had excellent biofuel properties.
Currently, the crop is in the experimental stage. Scientists need to do (152) work to determine under what conditions the plant grows best. This testing will be finished soon, and the plant should be out of the laboratory and in field trials by the end of the year.
A．make
B．had made
C．have made
D．would make

网考网参考答案：C
网考网解析：
[语法] 现在完成时 [错误答案] 从语意来讲是最近发现的，其影响一直延续至今，所以现在完成时要比过去完成时更恰当。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>