Ms. Silva sent the memo ______ it had been approved.A.soB.butC.afterD.until
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Ms. Silva sent the memo ______ it had been approved.
A.so
B.but
C.after
D.until
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正确答案: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.
