一道真题

People (have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget )them every time a new source of cheap energy is developed.
(A) have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget
(B) have discovered the principles of solar energy whenever fuel has become scarce and expensive but they forget
(C) discovered the principles of solar energy every time fuel becomes scarce and expensive, forgetting
(D) discover the principles of solar energy every time fuel became scarce and expensive, but they forget
(E) discover the principles of solar energy whenever fuel becomes scarce and expensive but forget

答案是E我选A

大全里的题,

LZ可以看一下大全里的解释.