帮忙分析几道英语语法题.16.The driver was at______loss when______word came that he wasforbidden to drive for speeding.A.a; / B.a; the C.the; the D./; / 27.Over the past decades,sea ice in the Arctic(北极) as a result of global warming.A.h

帮忙分析几道英语语法题.16.The driver was at______loss when______word came that he wasforbidden to drive for speeding.A.a; / B.a; the C.the; the D./; / 27.Over the past decades,sea ice in the Arctic(北极) as a result of global warming.A.h
帮忙分析几道英语语法题.
16.The driver was at______loss when______word came that he was
forbidden to drive for speeding.
A.a; / B.a; the C.the; the D./; /
27.Over the past decades,sea ice in the Arctic(北极) as a result of global warming.
A.had decreased B.will decrease
C.has been decreasing D.is decreasing
28.____ twice,the postman refused to deliver our letters unless we chained our dog.
A.Being bitten B.Bitten
C.Having bitten D.To be bitten
33.Lord Jim_____a private school five years ago with the money
he earned through hard work.
A.finds B.found C.founds D.founded
37.He____the maths examination if he had worked hard enough,
but he didn't.
A.would pass B.has passed
C.would have passed D.passed
38.Since it is already midnight,we______now.
A.had better leaving B.had better leave
C.had better to leave D.had better have left
帮忙分析几道语法题,本人英语基础薄弱,请尽可能讲得详细,

帮忙分析几道英语语法题.16.The driver was at______loss when______word came that he wasforbidden to drive for speeding.A.a; / B.a; the C.the; the D./; / 27.Over the past decades,sea ice in the Arctic(北极) as a result of global warming.A.h
16.A
at a loss固定短语,意为困惑地,不解地.word做消息,谣言讲为不可数名词,前边不须加冠词,这里came是不及物动词,that引导同位语从句,句子解释了先行词word的内容.
27.C
一般时间状语出现last,past,时态要用现在完成时,这里选了最接近的现在完成进行时态,强调北极的冰过去融化,现在融化,将来很可能继续融化下去.
28.B
过去分词作状语,表被动,邮递员是被狗咬了.A选项现在分词的被动式,强调正在进行,不合适.C选项的形式不对,应为having been bitten.D选项是不定式,不定式做状语只表结果和目的,此题句意是表原因的,所以D排除.
33.D
found成立,建立.过去式、过去分词是founded.
37.C
这是if虚拟条件句,跟过去事实相反,从句用过去完成时,主句用would have done.
38.B
这里since引导的不是时间状语从句,而是原因状语从句,since翻译成既然,由于,表示显而易见的已知的原因.had better后加动词原形.