Trắc nghiệm: Before giving presentation. always ___________ the focus on the projector so that everyone can read what is on the screen,Before giving presentation. always ___________ the focus on the projector so that everyone can read what is on the screen.

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Before giving presentation. always ___________ the focus on the projector so that everyone can read what is on the screen, Before giving presentation. always ___________ the focus on the projector so that everyone can read what is on the screen.

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