Tom is very modest. He never before his friends.A. shows off B. shows upC. turns offD. tu

问题补充：

Tom is very modest. He never before his friends.

A. shows off

B. shows up

C. turns off

D. turns on

答案：

(答案→)A. shows off

B. shows up

C. turns off

D. turns on

解析：动词短语辨析。A炫耀；B出现，露面；C关闭；D打开；句意：Tom很诚实。他从不在别人面前炫耀。根据句意说明A正确。