______ in the company for three years, Mark has become experienced in business negotiations.
A. Having worked
B. Have been worked
C. Have worked
D. Worked
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You ______ pay too much attention to your reading skill, as it is so important.
A. should’t
B. cannot
C. mustn’t
D. needn’t
—You do not forget when we borrowed that reference book, do you —I can not remember now but ______ sometime last week
A. might it be
B. could it be
C. could it have been
D. should it have been
You must ______ the rubbish before you leave the office.
A. dispose of
B. deal with
C. cope with
D. treat with
The Yellow River is one of ______ in China.
A. the long river
B. the longest river
C. the longest rivers
D. the longer river