45. By the mid-twentieth century, United States
presidential staffs, _________ had numbered fewer
than ten a century earlier, numbered in the hundreds.
まA.as
まB.that they
まC.which
まD.and
請問各位 答案是C
CD上的文法詳解我看過了它說只有C能夠引導非限定用法
那這樣WHICH的先行詞不就是Staff
which可以用來當staff(人)的先行詞嗎 謝謝