The US and Australia have jointly test fired a hypersonic missile capable of moving at a speed...........

English ( Master) Sentence Improvement

Directions: In the following questions, some part of the sentence is highlighted in bold. Which of the options given below the sentence should replace the part printed in bold to make the sentence grammatically correct? If the sentence is correct as it is given then choose option E ‘No Correction required’ as the answer.

The US and Australia have jointly test-fired a hypersonic missile capable of moving at a speed eight times more fast than sound, as part of $54-million research project.

at a speed eight times as fast as

at a speed eight times faster

with the speed eight times as faster asat a speed eight times much fast

at a speed eight times much fast

No improvement required

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Explanation:

Correct Option: B

The presence of the preposition 'than' right after the bold part confirm that an adjective of comperative degree must be used here. Option A and D get eliminated straightaway.

Option C is ungrammtical as an adjective of comperative degree is not used with 'as ... as' phrase.

Clearly, option B is the correct answer.