问题补充:
The form in and returned within three weeks.
A. is to be filled
B. will fill
C. is to fill
D. are going to be filled
答案:
(答案→)A. is to be filled
B. will fill
C. is to fill
D. are going to be filled
解析:时间状语within three weeks,表示将来的一段时间。be to表示将来一段时间内必定要进行的动作,而be going to表示“打算做某事”,故排除D,同时不定式的逻辑主语是form,动词形式用被动,排除B和C,故选A。