首先,A和C的主语应该是人,此句主语是a careful plan,所以排除A和C.
D不对是因为so that不能引导放在句首的从句.如果换个说法,如“A careful plan has to be made,so that we can finish the work on time.”就讲得通了.
首先,A和C的主语应该是人,此句主语是a careful plan,所以排除A和C.
D不对是因为so that不能引导放在句首的从句.如果换个说法,如“A careful plan has to be made,so that we can finish the work on time.”就讲得通了.