以下列出的土类型中，粒径最小的是（ ）。
A．粉土
B．砾石
C．砂土
D．漂石
参考答案：A
I would have gone to visit him in the hospital had it been at all possible, but I_______ fully occupied the whole of last week.
A．were
B．had been
C．have been
D．was
太阳系
