Question
Scientists have created a new substance that is so transparent as to be almost invisible.
Answer: Option B
:
B
While the standard idiom is so . . . that, so . . . as can also be used in certain situations but so . . . it is never correct. Eliminate (B). Eliminate (C) for a verb tense error: The sentence begins in the present tense (is . . . transparent) and has no reason to switch from is to the past tense was at the end. (D) is not idiomatic; transparent enough has to be followed by to be in this situation and transparent enough so as to be combines incompatible idioms. Even though the original sentence is rather clumsy, (A) is still the best option of the ones you're given.
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:
B
While the standard idiom is so . . . that, so . . . as can also be used in certain situations but so . . . it is never correct. Eliminate (B). Eliminate (C) for a verb tense error: The sentence begins in the present tense (is . . . transparent) and has no reason to switch from is to the past tense was at the end. (D) is not idiomatic; transparent enough has to be followed by to be in this situation and transparent enough so as to be combines incompatible idioms. Even though the original sentence is rather clumsy, (A) is still the best option of the ones you're given.
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