ORBIS doctors many patients, but patients do not have money to pay for the .
A. treat …treatment
B. treatment …treat
C. treating …treated
D. treated ….treating
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(答案→)A. treat …treatment
B. treatment …treat
C. treating …treated
D. treated ….treating
解析：考查：treat，动词治疗，treatment 治疗方法，治疗费用。句意：ORBIS医生给许多病人治病，但是病人没有钱付他们的医疗费。故选A。