______,they couldn't solve the mystery

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______,they couldn't solve the mystery
A)as they tried hard
B)tried as they hard
D)hard as they tried
D)no matter they tried hard
请说明选择的原因,并翻译全句
2)______,the crops would be saved.
A)it should rain
B)it rains
C)should it rain
D)it will rain
为什么选择C,为什么此句不能选择别的答案,为什么要倒装,请再翻译全句

两题都选C
1.虽然他们努力尝试,但还是不能解决这个谜题
就是一个固定句型,adj.+as+主语+谓语/表语,作为状语前置.如果放后面就直接用though they tried hard了
2.如果当时下了雨的话,庄稼就得救了
不能选别的答案这也是一个状语前置,当一个完整的句子做状语前置时就要到装.另外这个还是一个虚拟语气的状语,shuold的一个典型用法
理论上就这么些了,其实这种东西不会的话就多读,由于干了就不用想这么多了.这两句都很典型,多读几遍吧

______,they couldn't solve the mystery solve the mystery solve the mystery的中文翻译 He said that he couldn't solve the problem.翻译 We couldn't solve the problem without your help. He was able to solve the mystery. He ______. a．could if he w they have got _____ little help that they couldn't solve ___ 4.The students couldn't help ______ when they heard the joke They couldn't play football _______ because they had ______ they ______(appear) in the fog.we couldn't see them at all. This problem was so difficult they couldn't solve them.改写句子 They ----------(look )at the blackboard,but they couldn't --