He looks sad. Let’s .A. cheer up himB. cheer him upC. show him up D. show up him

问题补充：

He looks sad. Let’s .

A. cheer up him

B. cheer him up

C. show him up

D. show up him

答案：

A. cheer up him

(答案→)B. cheer him up

C. show him up

D. show up him

解析：

这题考查动词短语的用法，cheer up振作起来，show up出现，根据句意：他看起来很伤心，我们让他振作起来。还有代词应该放在动词和副词之间。所以选B。