Which of the following is not a guideline used in determining the correct tense for a verb?
A. Shift tense in order to indicate a change in time frame from one
action to another
B. When writing a paragraph or an essay, set a primary tense and use
occasional shifts to other tenses to indicate changes in time frame
C. Don't shift from one tense to another if the time frame for two
actions is the same
D. Shift between past and present tense as often as necessary when
writing about literature, but do not use the future tense

D, I believe.

Explanation:

depends on your school

when i was in high school i took ap biology my senior year and it was the hardest one for me because my teacher finished the material within the first month of school and then went on to doing advanced college level it was horrible. but at a nearby school ap biology was one of the easier aps. also, it depends on what you are interested i like math a lot so ap calculus was easier for me than most but i hate history so ap us government was harder for me than most.

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