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 （A）
(E) they increasingly engage in missions far different than the tasks for which they were built
看了两个讨论贴仍旧不太明白，窃以为A的increasingly位置很有问题，做题时首先排除了
请问C错在哪里，看到以前有同学说differ不对，但并未指出原因。
查了colins：If two or more things differ, they are unlike each other in some way.(例：The story he told police differed from the one he told his mother) 觉得differ在这里似乎没问题
还望NN指教~
不是NN~~~
我做这道题的时候, 是先通过后面未划线部分的and for which...判断出划线部分应该有与之平行的结构, 而B,C项里没有for which，所以第一步就排除了．
顶！
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