单选
With all the material she needed ____, she started to work on her thesis (论文).

a、being collected
b、having collected
c、collecting
d、collected

谁说的选a，还definitely！纯属误导祖国花朵！不知道就不要出来瞎说！众位高手，我们把she needed 这一定语从句去掉后再看看，with all the material_____, she started .........,,这样是不是就很容易选出答案D了呢？