______ to the classroom after the break time, he found ...

★ Adverbial Clauses

______ to the classroom after the break time, he found his bag was not there.

A. While he is returning

B. When he returned

C. Before he had returned

D. After he has returned

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Tom will take another attempt ______.

A. while he is going to fail the driving test once

B. as soon as he had failed the driving test once

C. after he will fail the driving test once

D. when he has failed the driving test once