Final answer:
The correct word to fill in the blank is 'would', resulting in the sentence 'Who taught you such tricks as Hesel would? Begin!'. Option d.
Step-by-step explanation:
The phrase 'Who taught you such tricks as Hesel?' appears to be a misinterpretation of a quote from Helen Keller's autobiography or similar texts, where her teacher, Anne Sullivan, is mentioned using the manual alphabet to teach Helen words such as 'doll'.
In contexts like these, the correct word to fill in the blank is often 'would', forming a past tense expression of willingness or habitual actions in indirect speech. Therefore, the complete sentence would be 'Who taught you such tricks as Hesel would? Begin!'
So option d.