问题

hdrtrw112

346. Ignoring the admonitions of his staff, the chief financial officer accepted the advice of the consulting company because he believed that the standardized accounting procedures would prove not only inexpensive but reliable indicators of economic performance.

(A) he believed that the standardized accounting procedures would prove not only inexpensive but

(B) the standardized accounting procedures will prove both inexpensive and also

(C) he believed the standardized accounting procedures would prove themselves to be both inexpensive and

(D) he believed that the standardized accounting procedures would prove to be both inexpensive and（D）

(E) standardized accounting procedures will prove his belief that they are both inexpensive and

其他几项都好排除，最后剩下了A和D，唯一的不同就是prove / prove to be，查了字典，解释说 prove (to be) sth，这下怎么好？不知道ETS的所谓规则是什么？

teyvhf

我觉得prove not only inexpensive but reliable indicators.. 是指 证明了某物（这个某物是incidators）

而prove to be both inexpensive and reliable indicators ...是指the procedures 证明了自己（procedures）是indicators.

我想prove sth. 和 prove to be sth.这两个逻辑意思是不同的。

多多讨论。