单选题 Susan has ______ the elbows of her son's jacket with leather patches to make it more durable.

【正确答案】 A

【答案解析】reinforce意为“增强，加固”；sustain意为“支撑，维持”；spread意为“扩散，传播”；confirm意为“确定，批准”。所填之词的宾语是elbows，根据后面的 make it more durable可知，应选reinforce。