Question

All these gifts must be mailed immediately__________ in time for Christmas.

A．in order to have received	B．in order to receive
C．so as to be received	D．so as to be receiving

Answer 1

C

试题分析：句意：所有的这些礼物必须马上被寄出，为了及时让这些圣诞节的礼物被收到。这里用so as to与in order to都可以表示目的，又因为gifts与receive之间是被动关系，故选C。
点评：本题难度适中。动词不定式是高中重要的语法项目，它的各种形式的用法及区别必须能灵活掌握，这里主要考查的是它的被动形式。
即学即练：Dinosaurs have completely died out on the earth，never _________ again.
A. to be seen                    B. being seen
C. seen                          D. having been seen
解析：A。句意：考查不定式短语作结果状语的用法。never to be seen again，意为：结果再也没有人见过。