Social institutions are now being called ______ to provide assistance to the hom

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问题 Social institutions are now being called ______ to provide assistance to the homeless.

选项 A、up
B、in
C、upon
D、off

答案 C

解析此题考查动词词组。call upon意为“号召，拜访”；call up意为“召唤，使想起，提出，打电话给”；call in意为“召集，召来，来访”；call off意为“叫走，放弃，使转移走，依次叫名”。

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