The sudden change in his behaviour came as a surprise to me, I began _________

Options

A. to cut a sorry figure
B. to smell a rat
C. to tum a new leaf
D. to blow hot and cold

Answer

B

Explanation

to smell a rat (Idiom) : to have suspicion
to cut a sorry figure (Idiom) : to be ashamed
to turn a new leaf (Idiom) : to reform and begin again
to blow hot and cold (Idiom) : to change one.s mind
Here, to smell a rat is the right usage