Do let your mother know all the truth; she appears everything.
A. to tell
B. to be told
C. to be telling
D. to have been told
网友回答
A. to tell
B. to be told
C. to be telling
(答案→)D. to have been told
解析：本题考查不定时的用法。分析第一句可知，she 与tell 之间存在被动关系，故排除A、C两项；由两句之间的逻辑可知，母亲已知一切，再隐瞒是没有用的，故一定要告诉母亲一切真相。所以选D。B表示将要被告知，不合题意。