____ the days he had spent with his American friends, he couldn’t help_____.
A.Keeping up; smile | B.Staying up; smiling |
C.Looking back on; smiling | D.Looking at; to smile |
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____ the days he had spent with his American friends, he couldn’t help_____.
A.Keeping up; smile | B.Staying up; smiling |
C.Looking back on; smiling | D.Looking at; to smile |