Ms. Silva sent the memo ______ it had been approved.

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问题 Ms. Silva sent the memo ______ it had been approved.

选项 A、so
B、but
C、after
D、until

答案C

解析 After is the correct subordinate conjunction showing a logical time relationship. Choice (A) shows cause and effect. Choice (B) expresses opposition. Choice (D) means till that time and no longer.  
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