(单选题)
The book was so interesting that he had read it for four hours ______ he realized it.
A.while
B.after
C.before
D.as soon as
参考答案:C
知识点:
(单选题)
The book was so interesting that he had read it for four hours ______ he realized it.
A.while
B.after
C.before
D.as soon as
参考答案:C
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