向CuSO₄、ZnSO₄、H₂SO₄的混合溶液中加入过量铁粉，反应后的溶液中一定含有 [ ]

A．ZnSO₄、H₂SO₄

B．FeSO₄、H₂SO₄

C．ZnSO₄、CuSO₄

D．ZnSO₄、FeSO₄

Such good use had been       his spare time_________ his English has improved a lot．

A．made of；as

B．made of ;that

C．made in；that

D．found in；as