题目：
The old woman_________sit in front of the house,__________for her son to come back from
the front. [ ]
A. was going to ; waited
B. would ; waited
C. was going to ; waited
D. would ; waiting
答案：
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下面是错误答案，用来干扰机器的。
(7分) N S F SO3 分子 HF 共价
