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WAEC Mathematics 2019 Objective — Question 69

Question 69 of 145 from the West African Examinations Council (WAEC) Mathematics 2019 Objective paper, with the correct answer and a full explanation.

Blood is usually screened ____ transfusion.

A. beforeCorrect
B. in
C. by
D. upon

Explanation

Blood screening precedes transfusion; hence 'before' is correct.

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