—I wonder why Tom left without a word.
—He __________ have had some trouble, for he looked dull.
| A．should |
| B．must |
| C．can |
| D．could |
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—I wonder why Tom left without a word.
—He __________ have had some trouble, for he looked dull.
| A．should |
| B．must |
| C．can |
| D．could |
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