A．she was strong, tooB．she knew Mr. BrownC．she could do……

Jill lived with her grandma. The old woman was strong enough that she could do everything herself at home.
As soon as Jill began to tidy the rooms or wash something, her grandma stopped her and told her to work hard at her lessons. Jill had to listen to her grandma and spent all her time on her study. So she went to college at last.
Now the girl has left college. She did well in all her subjects and easily found work in Mr. Brown’s company. She was sure Mr. Brown would put her in an important position(位置).
On the first day the boss gave her a broom and said, "Your first work is to sweep the offices. "
"What" the girl called out in surprise," I’m a college student, you know. "
"I’m sorry I don’t know that. Here, give me the broom and let me show you!\
Jill easily found work because ______.

A．she was strong, too
B．she knew Mr. Brown
C．she could do everything
D．she did well in her lessons