回答

誰があなた方を喜ばせたのか? → 1. Who(S) pleased(V) you(O)? 2. Who(S) made(V) you(O) happy(C)?

受動態:
1. Who were you(S) pleased(V) by? / By whom were you pleased?
2. Who were you(S) made(V) happy(C) by? / By whom were you made happy? ※どちらでもOKです

参考にしてください。

こっきー

ありがとうございます😭

taka

You're welcome!

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