You should not use context clues when: select all that apply.

a. a word appears frequently

b. you really need an exact meaning

c. your understanding of a whole passage depends on that word's meaning

d. you feel unsure of your guess

surrounding words are also unfamiliar

Option D and E

Explanation:

Context clues are basically used to provide a hint with in the sentence to identify a word. Basically , the surrounding information is used to identify the relevant word. It is an essential tool to analyse and comprehend word, also it determines the  word pronunciation and meaning. These clues may either be given in the same  sentence or the next sentence.

Hence, wherever there is an uncertainty or confusion context clues should not be used as it may misguide the reader.

Hence, option D and E are correct