I’m sorry I delayed_________ your letter because I have been quite busy these days.
A.
to answer
B.
to have answered
C.
answering
D.
answered
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参考答案:
举一反三
【单选题】Language and Communication A language is a signaling system which operates with symbolic vocal sounds (语声), and which is used by a group of people for the purpose of communication. Let's look at this(...