He spoke so（）that even his opponents were impressed by his words.
A、
frankly
B、
clearly
C、
convincingly
D、
loudly
【正确答案】：C
【题目解析】：
“他讲的如此有说服力，以至于他的对手也对他的话印象深刻”比较符合语境的是convincingly 具有说明力地； frankly 坦白地； clearly 清晰地； loudly 声音大地。
He spoke so（）that even his opponents were impressed by his words.
He spoke so（）that even his opponents were impressed by his words.
frankly
clearly
convincingly
loudly
“他讲的如此有说服力，以至于他的对手也对他的话印象深刻”比较符合语境的是convincingly 具有说明力地； frankly 坦白地； clearly 清晰地； loudly 声音大地。