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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