问题
选择题
The woman, when ______ how her husband was injured, began to cry.
A．asked
B．to ask
C．asking
D．ask
答案
答案：A
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The woman, when ______ how her husband was injured, began to cry.
A．asked
B．to ask
C．asking
D．ask
答案：A
同向的单位向量可表示为：().
