Clients are invited to write______ call for additional information.

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问题 Clients are invited to write______ call for additional information.

选项 A、but
B、or
C、not
D、either

答案B

解析 Or indicates a choice between items. Choice (A) indicates a contrast between items. Choice (C) is a negative, not a conjunction. Choice (D) is usually paired with or.  
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