单项选择题

As a salesman, he works on a(n) ______ basis, taking 10% of everything he sells.

A. income
B. commission
C. salary
D. pension
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单项选择题
Had he worked harder, he ______ the exams.
A. must have got through

B. would have got through
C. would get through

D. could get through
单项选择题
______ farewell, we watched as the car was running away.
A. Waving
B. Waved
C. To wave
D. Wave
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