题目内容

（2009.12）Would you please pass me the book ________ cover is black?

A. which
B. whose
C. that
D. its

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（2009.12） ________ in the company for three years, Mark has become experienced in business negotiations.

A. Having worked
B. Have been working
C. Have worked
D. Worked

（2009.12）Not until she arrived at the meeting room ________ she had forgotten to bring the document.

A. she realized
B. did she realize
C. she did realize
D. does she realize

（2009.12）John had never been abroad before, ________ he found the business trip very exciting.

A. because
B. though
C. so
D. while

（2009.12）________ some students are able to find employment after graduation, others will have to return to school and earn an advanced degree.

A. Since
B. While
C. Because
D. If