<p>By the end of 1945, Alice, thirty years old but already <an expert="" in="" the="" field="" of="" family="" dynamics,="" had="" begun="" writing=""> her memoirs.</an></p>
<p>A. same
C. <as an="" expert="" in="" the="" field="" of="" family="" dynamics,="" began="" to="" write=""></as></p>
<p>Is it A because "as an expert" is just kinda weird? or is this question testing the present perfect vs past? Can't you use both?</p>
<p>bumpppppppp</p>
<p>No, this has nothing to do with tenses. I’d pick A just because C sounds really awkward. The phrase set off by the commas modifies the noun Alice. Imagine saying, “Alice is thirty years old” - sounds good. “But Alice is already an expert…” - also good. However, “Alice is as an expert” just doesn’t work. I’m sure there’s a more correct way to explain the answer, but that’s just how I would approach it.</p>
<p>A is correct</p>
<p>Thanks I realized you could use both present perfect and past tense for the sentence, it doesn’t matter</p>