We'd better ________when he is thinking,as he prefers to solve problems on his own.( )
A. |
let him down |
B. |
cheer him up |
C. |
leave him alone |
D. |
ring him up |
We'd better ________when he is thinking,as he prefers to solve problems on his own.( )
A. |
let him down |
B. |
cheer him up |
C. |
leave him alone |
D. |
ring him up |