You can obtain the answer ______ adding the date of birth to this figure.
Correct answer: D. by
- A. in
- B. on
- C. to
- D. by
Explanation
By introduces the method used to obtain the answer: the answer is obtained by adding one figure to another. In and on do not express this method.
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About Prepositions
Prepositions link a noun or pronoun to the rest of the sentence, showing place, time, direction or relation. The difficulty is idiomatic rather than logical: English fixes particular prepositions to particular verbs and adjectives, so “good at,” “married to” and “differ from” have to be learned as units rather than reasoned out.
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