22. Extensive clinical and statistical studies have identified several factors ____ an increased risk of heart attack.
(A) as contributing to
(B) contributed to as
(C) to contribute as
(D) contribute as to

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統計： A(64), B(35), C(31), D(6), E(0) #2406762

情傷牛奶瓶

B1 · 2020/08/07

#4205512

Extensive clinical a...

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B2 · 2024/06/06

#6122162

Extensive clinical and statistical studies have identified several (factors) as contributing to an increased risk of heart attack.

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前面factors是個名詞，接as contributing to較通順。
語意: 廣泛的臨床和統計研究已經確定了導致心臟病發作風險增加的幾個因素。