thE govErnmEnt AgrEEs to instAll sErviCEs ______ By rEsiDEnts ovEr A tEn-yEAr pErioD.
A．whiCh ArE to BE pAiD For
B．For whiCh to BE pAiD
C．whiCh to BE pAiD For
D．to BE pAiD For whiCh