___ he had failed 50 times, Dr Linstill went on with his experiment.

(A)Even though   (B)In case   (C)Unless   (D) ..

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1.Despite是介系詞，引導一個介系詞片語，來修飾後面的句子。不可加子句

Despite the cold weather, she wears little as usual.-->(介系詞+受詞=介系詞片語)

Despite the fact that he was busy, he came to the station to meet us. 如果一定要連接兩個子句時，必須加上the fact 來當受詞。

2.前面有不定冠詞a Mexican carpet，所以用單數的one代表同一件東西。

Mrs. Smith wants to buy many Mexican carpets, but she can't afford to buy them.

Mrs. Smith needs one Mexican carpet, but she can't afford to buy it.

1.Despite是介係詞,介係詞後面要加名詞,你的題目句子"he had failed 50 times"這是一具完整句子(主詞+動詞),所以要用連接詞
(B)既然(題意不符)
(C)除非(題意不符)

2.這是一個冠詞使用的觀念
已經明確指出用 a 所以要用one來代替前面所提過的 a Mexican carpet