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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

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.