頁數：exercise 2 part5_Q107(ios軟體新多益test解析)
題目：
by teaming up, we finally solved the thorny problem that might ____
never have been solved by one person alone.
(a) solely
(b) fully
(c) further
(d) otherwise
疑問：
答案是d，我是用刪去法答對的，但我還是覺得用otherwise怪怪的，煩請協助解惑！
謝謝各位！