They ______ the launch of their new company only a year ago.A.announceB.are announcingC.ha
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They ______ the launch of their new company only a year ago.
A.announce
B.are announcing
C.have announced
D.announced
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正确答案:D
解析:The simple past of the verb is necessary because of the particular past time reference a year ago. Choice (A) is the simple present. Choice (B) is the present continuous. Choice (C) is the present perfect.
