Our family ( )have a hard life. 选择:A.couldn't B.could C.must't D.must

问题描述:

Our family ( )have a hard life. 选择:A.couldn't B.could C.must't D.must
选择. 然后翻译成中文
咋没一个一样的???

首先排除must以及must not.因为must表示必须,是人的意志愿望.主语是our family,must不符要求.如果表示猜测,must后面要接完成时态,所以cd都错.couldn't表示没有能力做到,如I COULD NOT SWIM是我不知道如何游泳.OUR FA...