问题
选择题
Whenever asked to help me with my lessons, he always refuses, ______ he is too busy.
A．to say
B．saying
C．says
D．having said
答案
答案：B
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Whenever asked to help me with my lessons, he always refuses, ______ he is too busy.
A．to say
B．saying
C．says
D．having said
答案：B