What 从句

rimm853

这里有讨论what的，但是都说用但是单数，但下面的题好像选C。 NN有何指教？谢谢

What concern scientists the most about global warming are the risks
that the polar ice caps will melt, the seas will grow too warm to
sustain marine life, and that violent weather patterns may result.

    

A. are the risks that the polar ice caps will melt, the seas will grow
too warm to sustain marine life, and that violent weather patterns may
result.

    

B. is the risks that the polar ice caps will melt, that the seas will
grow too warm to sustain marine life, and that violent weather patterns
may result.

    

C. are the risks that the polar ice caps will melt, that the seas will
grow too warm to sustain marine life, and that violent weather patterns
may result.

    

D. is the risks that the polar ice caps will melt, the seas will grow
too warm to sustain marine life, and that violent weather patterns may
result.

    

E. are the risks that the polar ice caps melting, seas growing too warm
to sustain marine life, and that violent weather patterns may result.


    

reallingling

划线外分别是讲了三个risks，所以谓语动词用are哦，个人认为如果只是一个risk，那么谓语动词用is

rpch2004

what从句中concern为复数形式，后面的are和concern对应

此外，请看og10的一题：

og211.The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established by carbon-14 dating, but what is much more difficult to determine are the reason for their decoration, the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.

(A) has been established by carbon-14 dating, but what is much more difficult to determine are

(B) has been established by carbon-14 dating, but what is much more difficult to determine is

(C) have been established by carbon-14 dating, but what is much more difficult to determine is

(D) have been established by carbon-14 dating, but what is much more difficult to determine are

(E) are established by carbon-14 dating, but that which is much more difficult to determine is

  正确答案为C：

（1）两个is保持一致

（2）第二个is和the reason保持一致

[此贴子已经被作者于2008-7-20 11:20:46编辑过]