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英语单项 求教Hard as the fire was_____,the firefighters didn't wit

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英语单项 求教
Hard as the fire was_____,the firefighters didn't withdraw.
A controlled B.to control C.to be controlled D.controlling
我觉得应该选择“A” 但是 答案是“B” 为什么呢
答案的确是B.加了两个单词,你就明白了:
Hard as the fire was FOR THEM to control,the firefighters didn't withdraw.
THEM == the firefighters .
语法结构:
something is hard (for sb.) to do
再不明白,就没有办法了.
再问: 动词加“ed"是不是表示”被动“ 火势被控制住
再答: 如果是 -ed, the firefighters didn't withdraw的存在就没有意义了。记住,你的句子是让步状语从句,“虽然 -- - ,但是 -- - -”你需要考虑进去。
再问: 这个句子是考察 让步状语从句了 我弄成考察”不定式“了 这该怎么区别
再答: 1 something is hard (for sb.) to do 2 让步状语从句的倒装:Hard as / that / though sth is, they - - - - -- -.