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17 These documents arrived on Thursday, A. arrived they D. didn’t there C. didn’t they D. weren’t they

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单项选择题16 Mr Black is the office you’ll be sharing this month.

A. man, whose
B. man, of whom the
C. man of whom the
D. man whose

单项选择题15 The number of orders went up we increased our prices by 15%.

A. because
B. although
C. when
D. if