IT took me only a few seconds to send all the e-mails.(保持原句意思)I ______ only a few seconds _______ all the e-mails.第二个空格填send 为何错?为啥要用on?

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IT took me only a few seconds to send all the e-mails.(保持原句意思)
I ______ only a few seconds _______ all the e-mails.
第二个空格填send 为何错?为啥要用on?

因为 spend···on ······
或者是spend······(in)doing