I didn't know when I would start.(同意句)I didn't know when _.

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I didn't know when I would start.(同意句)I didn't know when ______ _______.
I didn't know when I would start.(同意句)
I didn't know when ______ _______.

I didn't know when I would start.(同意句)I didn't know when ______ _______.
to start