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请解释下为什么选这个,答得好

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请解释下为什么选这个,答得好
1 Whenever I met with some difficulty,I-----to Bob for
A would turn B should turn C had turned D was turning
2 This is one of the experiments----on in our laboratory.
A being carried B carried C carrying D to carry
3 The construction of the laboratory ----before the end od next month.
A must complete B must be completed C must have completed
D must have been completed(不应该用将来完成时么?可这几个选项没有啊)
4 Just after answering the phone,-----.
A the doorbell rang B Lucia heard the doorbell
C the doror was knocked loud
5 Professor Li gave us a wonderful lecture yesterday,-----important information he gave us!
A What an B How C How an D What
6 We all know the truth that ----there are air,water and sunlight;there are living things.
A in wherever B that wherever C where D that
7 I-----have been there,but I-------not find the time.
A should ;would B should ;could C might ;could D could; could
请解释下为什么选这个,答得好
A 可以这么认为 如果从句是一般现在时,主句就是will ,改成一般过去时,主句就应该为过去将来时
B 先判断主被动,在根据时态翻译,看哪种时态通顺,过去分词做后置定语
D before the end of next month,说明用完成时,表示对将来的肯定猜测
B 主语要一致
D information不可数,所以没有an、a ,如果是用how,就应该是how important the information is,一句话,what后是一个名词短语,中心词是名词,how +adj+冠词+名词+动词
C 套用了Where there is a will ,there is a way的句式,where前面不能有in,that又重复
B 本该做却没做,第二个空是can的过去式,不能找到时间