Let’s learn to use the problem we are facing ______ a stepping-stone to future success.

A. to               B. for                       C. as            D. by

Let’s learn to use the problem we are facing ________ a stepping-stone to future success.

A. to           B. for          C. as               D. by

Let’s learn to use the problem we are facing      a stepping-stone to future success.

A. to                                   B. for                    C. as                            D. by

Let’s learn to use the problem we are facing      a stepping-stone to future success.

A. to                   B. for          C. as               D. by

Let’s learn to use the problem we are facing ________ a stepping-stone to future success.

A. to                     B. for                    C. as                            D. by