Only when Lily walked into the office ______ that she had left the contract at home.
| A． | she realized | B． | has she realized |
| C． | she has realized | D． | did she realize |
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Only when Lily walked into the office ______ that she had left the contract at home.
| A． | she realized | B． | has she realized |
| C． | she has realized | D． | did she realize |
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