✨ ベストアンサー ✨
[2]
(1) ③ than ⇒ as ← [as] good at tennis [as] you think he is.
(2) ② lets ⇒ had let(過去完了) ← I [wish] he [had let](仮定法過去完了):<過去の事実>(=he <didn't let> us know … <a few days earlier>)の反対を仮定
(3) ③ what do you think of ⇒ what we thought of:間接疑問文
They asked us what we thought of their country while emphasizing how much they loved Japan.
彼らは私達に彼らの国をどう思うかと尋ねながら、同時に彼らがいかに日本が大好きであるかを強調した。
参考にしてください。