_____ afraid _____ behind, Bill studied
问题:
_____ afraid _____ behind, Bill studied even harder than ever before.
A.To be; of falling
B.Being; fall
C.Being; of falling
D.To be; to fall
_____ afraid _____ behind, Bill studied even harder than ever before.
A.To be; of falling
B.Being; fall
C.Being; of falling
D.To be; to fall