问题补充：
The famous actor keeps fit by for an hour every morning.
A. sticking out
B. standing out
C. making out
D. working out
答案：
A. sticking out
B. standing out
C. making out
(答案→)D. working out
解析：选D考查动词短语辨析。句意：这个著名的演员通过每天早上锻炼一个小时来保持健康。stick out“突出”；stand out“显眼”；make out“理解”；work out“锻炼身体”。故D项符合句意。
