(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
请问一：此句如何译为中文？
请问二：b或c为何不选？

(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
请问：若是c选项，改为过去完成式「had accomp ..

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D)4.The river _______ runs through London is the Thames. (A)it (B)who (C)where (D)which
请问一：就a选项而言，此句不能是 that省略的用法吗？
请问二：c不能选是因为where不能当子句的主词吗？若改成The river where it runs through LONDON is Thames.这句对吗？

个人思考：
解答一：形容词子句的关系代名词为主词时，不可省略！只有当受词时，才能省略！

解答二：以文法来看，where带出的是副词子句，其不可当子句的主词，而which带出的是形容词子句，可当主词或受词！
当然，其也有变型，例如：
The place where you visited yesterday is my most favorite one.
The house which you rent in before is even cheaper now.