David didn't give up (）he had failed in the experiment four

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David didn't give up (）he had failed in the experiment four times.Aif Bwhile Cthough Dsince
Mr.zhao is very helpful.He often helps us () we are in trouble.
A.whether B.although C.whenever D.however
急,说明理由

你好,同学

正确答案：

1. 选C. though 尽管

翻译：尽管大卫做实验失败了四次,但是他没有放弃.

解析：though 是尽管的意思,引导让步状语从句,其它选项与题意不符.

2. 选C. whenever 无论何时

翻译：赵老师非常乐于助人,不管什么时候我们遇到困难,他都经常帮助我们.

解析：whenever 是无论何时,不管什么时候的意思.

希望能帮到你,祝更上一层楼O(∩_∩)O
有不明白的请继续追问,可以详谈嘛(*^__^*)
再问：第一题中，while也有虽然的意思啊
再答： while 一般表示两者之间对比，应该是“但是”的意思，没有虽然的意思

David didn't give up (）he had failed in the experiment four He didn t give up the plan though he had failed mamy times Though he failed in making a model ship ,Tom didn't give up. absorbed in the experiment that he didn't even He didn't give up the plan though he______many times. He didn't get up ________, and he failed to catch the train． He had great difficulty___it .But he didn't give up.A.finish （）the experiment that he gave up. He didn't pass the exam.Instead ,he failed it. he didn't pass the exam. _Instead ______, he failed. He didn’t ___ and so he failed the examination in no case will he give up the experiment.中有什么语法内容?能否详细阐述,