单选题：Ihaveto（　　）myvisitasI'llbeverybusynextweek．

题目内容：

Ihaveto（　　）myvisitasI'llbeverybusynextweek． A．callfor
B．callon
C．calloff
D．callin

参考答案：

答案解析：

Doyoumeanthisisthe（　　）decisionyouhavemadeafterthinkingforhou

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