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Question:

(1) The mechanic performed a number of diagnostic tests on the car.
(2) The mechanic used a computer to perform the diagnostic tests.
What is the BEST way to combine sentence 1 and sentence 2?

A The mechanic used a computer to perform a number of diagnostic tests on the car.
Explaination

This choice makes it clear that the mechanic used the computer in order to perform the tests. Choice A makes the use of the computer appear incidental, while Choice C suggests that the mechanic was obliged to perform the tests because he used a computer.