下列方程组中，是二元一次方程组的为（ ）。
---- _______ your math teacher? ---- Mr. Zhao. A. What's B. Who's C. Where's
Do you have a new teacher? A. Yes, I am. B. No, I don't. C. No, I do.
We played _____ soccer after school.
We don’t have _____ class _____ Saturday.
She ____ her bike to school
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