Question

The strength I have ____ to be doubled before I start my new project.
a)needs
b)need
c)needed
d)is needing
with brief explanation

Answer 1

HOLA

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The strength I have needs to be doubled before I start my new project

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All the other word given in the sequence do not match the sentence

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HOPE U UNDERSTAND ☺☺☺☺

Answer 2

a. needs
Present perfect tense.
There is already a past tense present in the sentence (doubled), no two past tense are allowed in the same sentence, next
If you want to use needing , the sentence must be "I have been.....



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