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In Angkor, Cambodia's ancient city, a (clever) designed reservoir, five miles long and one mile wide, (supplied fish) (and) helped farmers (to produce) three corps of rice annually.
I know that the answer is A, it should be cleverly but doesn't "to produce" lack parallelism?
Five years in (the writing), her new book is (both a response) to her critics' mistrust (with) her earlier findings and (an elaboration) of her original thesis.
Is this an idiom error?