[求助]SC大全-142

以下是引用samsonerin在2003-11-14 10:45:00的发言：
142.As U.S. nuclear attack submarines prowl their familiar haunts deep within the
        oceans of the world these days, they increasingly are engaged in missions far
        different from the tasks for which they were built and for which their crews
        were trained over the last forty years.

         (A) they increasingly are engaged in missions far different from the tasks for
               which they were built
         (B) the missions they increasingly engage in are far different than the tasks
              they were built for
         (C) they engage increasingly in missions that differ significantly from the tasks
              they were built for
         (D) the missions they engage in are increasingly different than the tasks for
               which they were built
         (E) they increasingly engage in missions far different than the tasks for which
               they were built

請問各位XDJM：
看來A 是沒問題且也符合Parallelism的需求，但幾個小地方請教大家：
(1) engage 在這兒一定要用 be engaged in 而不能用 engage in 嗎?

用主动和被动，主要和句意相关。

(2) 選項A中的increasingly 的位置放在 are 之前看起來好像怪怪的??

是有点怪，但是并没错
謝謝各位鼎力相助！