Question

-  When should I hand in my paper?
— Your paper must  _   as soon as the bell_   .

A．hand in; rings	B．hand in; will ring
C．be handed in; will ring	D．be handed in: rings

Answer 1

D 解析:
被動語態(tài)與as soon as的用法。paper作主語 (為“交卷”的承受者)，故要用被動語態(tài)，as soon as表示“一……就……”，從句用一般現(xiàn)在時代替一般將來時。故選擇D。