They ______ the launch of their new company only a year ago.

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问题 They ______ the launch of their new company only a year ago.

选项 A、announce
B、are announcing
C、have announced
D、announced

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.  
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