There is a small bridge _ the river and some ducks are swimming _ it.A.under; over B.over; ...
问题描述：
There is a small bridge _ the river and some ducks are swimming _ it.A.under; over B.over; ...
A.under; over B.over; below C.over,under D.on,behind
答
C over.under
a bridge over the river,under the bridge请你记住就是了,是固定的用法了.