Mr. Lin when I go to see him on Sundays.
A. is always working
B. was always working
C. always worked
D. has always worked
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(答案→)A. is always working
B. was always working
C. always worked
D. has always worked
解析：考查时态。现在进行时与always连用，表示一种感情色彩。句意：当我在星期天去看他的时候，林先生总是在工作。本题表示表扬林先生总是在工作。故A正确。