单选题Ms. Silva sent the memo ______ it had been approved.AsoBbutCafterDuntil
单选题
Ms. Silva sent the memo ______ it had been approved.
A
so
B
but
C
after
D
until
参考解析
解析：
after作连词，表示“在…之后”，在此处符合句意“在被批准后，Ms. Silva发送了备忘录”，故选C。until直到…，常与not一起连用。
after作连词，表示“在…之后”，在此处符合句意“在被批准后，Ms. Silva发送了备忘录”，故选C。until直到…，常与not一起连用。
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