What ____ him on his way to school yeste_爱下问搜题

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问题选择题

What ____ him on his way to school yesterday?[ ]

A. happened

B. happened to

C. was happened

D. was happened to

答案

答案：B

选择题

—__________ do I have to change the robot’s batteries? —Every two months.

A．How long

B．How soon

C．How often

D．How many

填空题

生铁的种类：“大块”指（）。