______ this afternoon, all the participants will have been inside ...

★ Adverbial Clauses

______ this afternoon, all the participants will have been inside the hall.

A. Once the conference had started

B. By the time the conference will start

C. Before the conference is starting

D. When the conference starts

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You should keep the milk in the refrigerator …………… it doesn’t go bad.

A. since

B. because

C. so that

D. after