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

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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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