【单选题】
Since the road is wet,（） last night.
A、it must have rained
B、it must rain
C、it must be raining
D、it must have been raining
查看正确答案
A、The securing of cargo on flats and trailers must be adequate to withstand road motions only B、The movements experienced by road borne cargo are the same as the movements of a ship at sea C、The generally recommended lash angle is no greater than 45 degrees relative to the deck in any direction D、It is not necessary for an adequate number of securing points on the vehicles themselves since setting the brakes is sufficient
