Generally, senior citizens enjoy their freedom and they prefer to live on their own they can.
A. as long as
B. as far as
C. now that
D. even though
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(答案→)A. as long as
B. as far as
C. now that
D. even though
解析：句意：一般说来，老年人愿意享受自由，只要他们能够自己住他们喜欢自己住。as long as只要；as far as直到；now that 既然；even though即使。根据句意故选A。