If this period is not convenient. please tell us as soon as possible of the dates on which
A. 如果这段时间你们感到不便，请速告我们哪一天愿意到达。
B. 如果这段时间你们感到不便，请速告之我们合适的抵达日子。
C. 如果这段时间你们感到不便，请速告你们到达的日子。
D. 如果这段时间你们感到方便，请速告你们随便哪一天抵达的日子。
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Pure oxygen is provided for ______ .
A. research workers in high mountains
B. children
C. patients
D. both A and C
______ cannot live without oxygen.
A. Plants
B. Animals
C. Human beings
D. A, B and C
By using credit, people can______.
A. pay regular and day-to-day expenses
B. avoid unnecessary payment
C. save money to cover future cost
D. pay an unexpected expense too big to be paid at the moment
So badly______in the car accident that he had to stay in hospital for a few months.
A. did he injure
B. injured he
C. was he injured
D. he was injured
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