__________ they did research on the internet, the students presented ...

★ Adverb & Compound Sentences

__________ they did research on the internet, the students presented their arguments, __________ they were able to have a meaningful discussion.

A. After, and

B. Since, or

C. When, but

D. If, or

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__________ the concert ended, the audience clapped loudly, __________ they really showed their appreciation.

A. Once, so

B. Since, but

C. When, but

D. if, so