题目内容
—I can’t get through to the general manager’s office anyhow.
—The line is busy. Someone _____ the telephone.
A. must use B. uses C. must have been using D. must be using
D
must be doing表示对现在正发生情况的肯定推测。
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题目内容
—I can’t get through to the general manager’s office anyhow.
—The line is busy. Someone _____ the telephone.
A. must use B. uses C. must have been using D. must be using
D
must be doing表示对现在正发生情况的肯定推测。