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During the year the President turned his attention to ____ag

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During the year the President turned his attention to ____agriculture
A.improve B.improvement C.improving D.improved
这里为什么选C to在这时介词么?
This is the problem ____ at the meeting now
A.discussed B.being discussed C.to be discussed D.discussing
这里为什么选B 别的选项为什么错呢
The fireman rushed into the building ____by the fire in spite of danger
A.eaten up B.to be eaten up C.being eaten up D.having been eaten up
这儿为什么是C 其他的选项哪里错了?
1、turn one's attention to doing是固定搭配,把注意力集中于.
2、"now"用进行时,而问题是被讨论,因此选B.A是过去式,We discussed the problem yesterday.C是将来式,The problem to be discussed tomorrow is.D是现在进行式,We are discussing the problem.
3、冲进火场的瞬间就被火吞噬了,所以应该是同时发生的,这是一个从句.A吞噬,没有"be"被,错;B将来式,错;D现在完成进行式,应该是同时发生,错.