Which sentence has a compound verb? ( a) your brain you to take a test. (b) your brain has 100 billion nerve cells, which are called neurons. (c) your brain, a very complicated organ, has many functions. (d) your complex brain thinks and controls your breathing at the same time.

A) Your brain helps you to take a test.

Explanation: a compound verb is  is a verb that is made up of multiple words. The compound verb can take on such forms as:  a prepositional verb  (for example: believe in, ask for, etc), a phrasal verb  (like: take down, work on, etc), a verb with auxiliaries  (like: are walking, will eat, etc), and a compound single-word verb (such as: double-click, color-code, etc). From the given options, the sentence that has a compound verb is option A, because the verb "help to take" is made up of multiple words.

about the letter or who wrote the letter

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explanation: