(D)1.The Ministry of Defense has faced numerous difficulties getting volunteers ________ in the military. (A)be enlisting(B)who enlist(C)that enlist(D)to enlist
請問一：此句如何譯為中文？
請問二：b或c為何不選？

(A)2.Just look at how much we _____ when we worked together last week. (A)accomplished(B)can accomplish(C)have accomplished(D)have been accomplishing
請問：若是c選項，改為過去完成式「had accomp ..

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D)4.The river _______ runs through London is the Thames. (A)it (B)who (C)where (D)which
請問一：就a選項而言，此句不能是 that省略的用法嗎？
請問二：c不能選是因為where不能當子句的主詞嗎？若改成The river where it runs through LONDON is Thames.這句對嗎？

個人思考：
解答一：形容詞子句的關係代名詞為主詞時，不可省略！只有當受詞時，才能省略！

解答二：以文法來看，where帶出的是副詞子句，其不可當子句的主詞，而which帶出的是形容詞子句，可當主詞或受詞！
當然，其也有變型，例如：
The place where you visited yesterday is my most favorite one.
The house which you rent in before is even cheaper now.