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[D52] Go in quietly ________ wake the boy.

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[D52] Go in quietly ________ wake the boy.
A.in order to
B.so as to
C.in order not
D.so as not to
请翻译,并分析.
翻译:轻声进去,以免吵醒那个男孩子.
此题考查目的状语的否定用法.
1.固定短语so as to do sth和in order to do sth,意思是“为了...”,在句中做目的状语.
如:In order to enter a university,he is studying hard.
= To enter a univeristy,he is studying hard.
= He is studying hard in order to enter a university.
= He is studying hard so as to enter a university.
= He is studying hard to enter a university.
为了考取大学,他正在努力学习.
其中,so as to do sth不能放在句首.
2.上述结构的否定式为in order not to do sth和so as not to do sth,即在不定式符号to前面加上not.
如:Take enough exercise in order not to get sick.
= Take enough exercise so as not to get sick.
3.该题中的不定式根据句意为其否定形式,所以排除AB;
C中少了to,排除.
正确答案为D.