You should understand the traffic rule by now. You've had it _____ often enough. [ ]

A. explaining

B. to explain

C. explain

D. explained

农村土地调查中，需要补测的地物内容有（）。

A.零星地物

B.被阴影、云影所遮盖而未成像的地物

C.在土地利用规划中马上要改变用途的地物

D.成像时间到调绘期间出现的新增地物

E.由于比例尺较小无法直接解译、调绘的较小地物