Hello, there. There is a sentence as follow: He rode his bike to school this morning __________ .

A. in time B. on time C. as usual D. at the same time.

It's a multiple choice in the students' exercise book. My students ask me why 'B' is the answer, I just don't know how to explain this. Please help me. Many thanks.

A. in time B. on time C. as usual D. at the same time.

It's a multiple choice in the students' exercise book. My students ask me why 'B' is the answer, I just don't know how to explain this. Please help me. Many thanks.

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