_______that math problem made Tom very happy A working B work out C solving D solve

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_______thatmathproblemmadeTomveryhappyAworkingBworkoutCsolvingDsolve_______thatmathproblemmadeTomver

_______that math problem made Tom very happy A working B work out C solving D solve
_______that math problem made Tom very happy A working B work out C solving D solve

_______that math problem made Tom very happy A working B work out C solving D solve
c,solving

c

c

C

答案C。本题考查的是动词ing形式作主语,故不能选B\D,而work是不及物动词,后面不能跟宾语,故选C。