问题
选择题
She rubs her teeth with her finger _______ she wants to brush her teeth. This is done after every meal.
A．when
B．until
C．since
D．while
答案
答案：A
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She rubs her teeth with her finger _______ she wants to brush her teeth. This is done after every meal.
A．when
B．until
C．since
D．while
答案：A