An error identification question:<br/><br/><font color="#006400">Working as he (A) <u>was</u> in (B) <u>such</u> a dangerous environment, Mr. Choi (C) <u>insured</u> his life (D) <u>for</u> a large amount of money.</font><br/><br/>The given answer is A, but I don't what I should change for it. Please advise.<br/><br/>LCChang