—Hi, Mary. It never entered my head that you’d come. What a surprise!
—I’m on a business trip in the city and I ______ in on you.
| A．dropped | B．drop | C．had dropped | D．have dropped |
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—Hi, Mary. It never entered my head that you’d come. What a surprise!
—I’m on a business trip in the city and I ______ in on you.
| A．dropped | B．drop | C．had dropped | D．have dropped |
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