新prep-1 178 从来没讨论过的，请大家都过来帮帮看看！

178.
            Last week local shrimpers held a news conference to take some credit for the resurgence of the rare Kemp's ridley turtle, saying that their compliance with laws requiring that turtle-excluder devices be on shrimp nets protect adult sea turtles.

B. requiring turtle-excluder devices on shrimp nets is protecting

C. that require turtle-excluder devices on shrimp nets protect

D. to require turtle-excluder devices on shrimp nets are protecting

E. to require turtle-excluder devices on shrimp nets is protecting

(答案：B)说句实话，真是不懂啊！

我对此句子结构的理解是：主语：shrimpers；谓语：held；现在分词结构saying that...在句尾做伴随结果状语。

参考了《PREP 语法笔记》中说的：

to do表示目的或者将来要做的情况，排除D，E；

对于C选项：that从句修饰law，引导law的同位语，说明law的内容。（本人选C）

而且，我也记得《PREP 语法笔记》和《白勇语法》中说过，原文的时态不要随意改动！

怎么答案B ：变成了is protecting 现在进行时态了！请大NN和各位大侠，帮帮忙吧，谢谢了！