There was a job for me to cut my teeth on. A. to try B. to gain experiences C. to sharpen my wits D. to earn a decent salary

The correct answer is: B. to gain experiences.

To

cut one’s teeth on something means to do something for the first time, especially in order to gain experience. In this case, the speaker is saying that they have been given a job that will allow them to gain experience in a new field.

The other options are incorrect because:

• A. to try is not the same as to gain experience. Trying something does not necessarily mean that you will gain experience from it.
• C. to sharpen one’s wits means to
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  make oneself more intelligent or clever. This is not the same as gaining experience.
• D. to earn a decent salary is not the same as gaining experience. Earning a decent salary is a goal that many people have, but it is not the same as gaining experience.