A: The problem proved more difficult than it seemed at first.
Can "at / in the beginning" be used instead of "at first"?
Here, I think, the speaker is in the early stage of a recognition process, so "at / in the beginning" can be correctly used. Am I right?
anonymous "at / in the beginning" You can write ... at first or ... at the beginning (more usual) or ...
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anonymous"at / in the beginning"
You can write
... at first
or ... at the beginning (more usual)
or ... in the beginning (less usual).
anonymousthe speaker is in the early stage of a recognition process