She is always the first staff to go to the office and the last to leave，______ I guess is why she is promoted so quickly.
| A．who | B．which | C．that | D．what |
相关试题
The life of Milu ____ at present.
| A．is been studied | B．is being studied | C．was being studied | D．have been studied |
lish.I was just about to go out last night ______ the telephone rang.
| A．while | B．when | C．as | D．before |
I can’t hear you because there is _________noise there.
| A．very much | B．too much | C．much too | D．so many |
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