It is well known that teaching is a job ______ enough patience.

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问题 It is well known that teaching is a job ______ enough patience.

选项 A、calling on
B、calling off
C、calling for
D、calling in

答案C

解析 巳本题考查的是动词词组。call on号召,呼吁;call off放弃;call for要求,提倡;call in召集,来访。众所周知,教学需要耐心。
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