填空题

I apologize for not (keep) ______ my promise.

【参考答案】

keeping
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单项选择题
A．Salesman and customer.B．Boss and employee.C．Doctor and patient,D．Teacher end student.
A．Salesman and customer.
B．Boss and employee.
C．Doctor and patient,
D．Teacher end student.
填空题
We should prefer them (come) ______ next week.
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