文档介绍：equipment and other improvements reduced the amount of time-from eleven hours in 1982 to six in 1988-needed by workers so that they could produce a ton of steel.
by workers so that they could produce
when workers are producing
need in producing
needed to produce
need for their producing of
A so that表目的,但是逻辑句意不表示目的
B are与主句的时态不一致,而且when扭曲了原句表达的意思
C need 的用法错误,而且时态不一致
E 时态不一致,their producing名词形式累赘
所以选D
that so much data travels via light--., is carried in glass fibers rather than by electrical current--one goal of semiconductor research is to develop a silicon chip that can transmit and receive light signals directly, a development that may one day lead to smaller, faster semiconductors.
develop a silicon chip that can transmit and receive light signals directly, a development that may one day lead
develop a silicon chip with the capability of transmitting and receiving light signals directly, which may one day lead
development of a silicon chip that has the capability of transmitting and receiving light signals directly, a development maybe one day leading
a silicon chip that can transmit and receive light signals directly, which may one day lead
a silicon chip with the ability to transmit and receive light signals directly, with this development maybe one d