__________ the teacher explained the concept well, the students understood ...

[ Adverb & Compound Sentences ]

__________ 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

Select your answer:

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Progessive Tenses Conditional Sentences and Verb Form Simple Present Negative and Question Types of Preposition Conjunctions and Transitions Offering Help So / Neither / Either / Too Articles and Demonstratives Transitive and Intransitive Verb

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