2. 外语
  3. Our company ______ Metro Messenger Service since 1998.

Our company ______ Metro Messenger Service since 1998.

admin2011-01-13  26
问题 Our company ______ Metro Messenger Service since 1998.
选项 A、use
B、used
C、had used
D、has been using
答案D
解析 An action that has been happening in the past and is continuing in the present may use the present perfect continuous. Choice (A) is the simple form. Choice (B) is the past tense. Choice (C) is the past perfect tense.  
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