摘要： He his aunt’s when he went to Wuhan on business. A. called on B. called at C. dropped in on D. dropped in
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He __________ his aunt’s when he went to Wuhan on business.
A. called on B. called at C. dropped in on D. dropped in
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He __________ his aunt’s when he went to Wuhan on business.
| A．called on | B．called at | C．dropped in on | D．dropped in |