__________ the concert ended, the audience clapped loudly, __________ they ...

★ Adverb & Compound Sentences

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

A. Once, so

B. Since, but

C. When, but

D. if, so

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__________ the teacher explained the concept well, the students understood it, __________ they could apply it effectively.

A. Once, and

B. Since, and

C. When, but

D. If, or