these are the reasons which,____ to the tiredness ,cause Andrea to sleep so soundly.A.add B.to add C.adding D.added选哪个?为什么?cause 是谓语?原题应改为:These were the reasons which,___ to the tiredness,cause Audrea to sleep so soundl

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these are the reasons which,____ to the tiredness ,cause Andrea to sleep so soundly.
A.add B.to add C.adding D.added
选哪个?为什么?cause 是谓语?
原题应改为:These were the reasons which,___ to the tiredness,cause Audrea to sleep so soundly.
刚才看错了。cause 是定语从句的谓语是一定的,但时态值得磋商,似改为过去时为好。但added 为过去分词,相当于which was added to the tiredness,

which cause Andrea to sleep so soundly 是reasons的定语 cause 在从句中做谓语.
选D 这句话的意思是 这些,加上劳累,是Andrea睡得这么沉的原因
add to 是加上的意思 这里表被动 用现在分词

personal opinion:
选C 句子的主干是there are句型,which cause andrea to sleep so soundly 是一个非限制性定于从句。整个句子的谓语是are

选D,句中应该说的是reasons added to the tiredness cause Andrea to sleep so soundly,中间那个added to the tiredness是reasons的定语,而整个which...so soundly也是reasons的定语从句。前面那个定语因为是过去分词定语,所以用added