It's to do____celebrating the first harvest after the settlers from Europe went to live in the USA.这个空该填什么介词?

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It's to do____celebrating the first harvest after the settlers from Europe went to live in the USA.这个空该填什么介词?
x),Q/V(WHɏԜԤĒ̼tT̢ĢT VZ/N-)I-*VH+Up--/HU(O+YVb';V=_O~Ύ'_ﵷI*ҧu~

It's to do____celebrating the first harvest after the settlers from Europe went to live in the USA.这个空该填什么介词?
It's to do____celebrating the first harvest after the settlers from Europe went to live in the USA.
这个空该填什么介词?

It's to do____celebrating the first harvest after the settlers from Europe went to live in the USA.这个空该填什么介词?
for吧,不一定对

for