单项选择题
A:Do you know our company at all? B:No, it's the first time（）here.
A. I had been B. I am coming C. I was D. I have been
单项选择题 A:Im afraid Mr. Watson is not in the office at the moment. B:（）
单项选择题 We employ about seven hundred full-time people. But we（）causal staff when we need them.
单项选择题 A:Something important has come up.（） B:Can it wait? I’ll be through in ten minutes.
