单选题 The grain could have been gathered in last week if the weather had been fine; but, ______, it had to be left in the fields.
A. as it is B. as it were C. as it was D. as it had been

【正确答案】 C

【答案解析】as it was“照当时的样子；实际上”，这个结构是在叙述与事实相反的情节后，进而说明真实情况，如本句“如果天气好，上星期就可以把粮食收回来，但事实上(天气不好)只好把粮食留在地里”。as it was不是一个单纯的插入语，其中it指“天气(不好)”，was必须用在和它时态一致的句子里。as it were是一个插入语，表示虚拟语气“好像”，相当于as if it were actually so的省略，用在此句中不合适。A、D时态不对。