【单选题】 Ms. Silva sent the memo ______ it had been approved.
A．(A) so
B．(B) but
C．(C) after
D．(D) until
网考网参考答案：C
网考网解析：
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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