A question.Do you know?It's more difficult for an old man -------- (to speak / speaking / speak / speaks) English well.

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A question.Do you know?It's more difficult for an old man -------- (to speak / speaking / speak / speaks) English well.

A question.Do you know?It's more difficult for an old man -------- (to speak / speaking / speak / speaks) English well.
A question.Do you know?
It's more difficult for an old man -------- (to speak / speaking / speak / speaks) English well.

A question.Do you know?It's more difficult for an old man -------- (to speak / speaking / speak / speaks) English well.
to speak
It+be动词+adj+for sb + to do sth

to speak

to speak吧- -!

to speak