Since i didn't know what to do,.改成_ _what to do
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Sinceididn''tknowwhattodo,.改成__whattodoSinceididn''tknowwhattodo,.改成__whattodoSinceididn''tknowwhattodo
Since i didn't know what to do,.改成_ _what to do
Since i didn't know what to do,.改成_ _what to do
Since i didn't know what to do,.改成_ _what to do
Since i didn't know what to do
=Not knowing what to do
用动名词作主语,表示原因