031. Choose correct wh-type question to get underlined part. Water is needed to sustain life on the earth. (1) Who is needed to sustain life on the earth? (2) Which is needed to sustain life on the earth? (3) Whose is needed to sustain life on the earth? (4) What is needed to sustain life on the earth?
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Answer:
option (4) what
Explanation:
water is an inanimate object and as as such options 1 and 3 can be ruled out immediately. which is more commonly used in front of a noun and in several senses like an adjective. hence what is most appropriate choice.
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