单项选择题

The conference has been held to discuss the effects of tourism ______ the wildlife in the are

A． inB. onC. atD. with
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单项选择题
The number of the employees has grown from 1,000 to 1,200. This means it has risen ______ 20%.
A．by
B．at
C．to
D．with
单项选择题
______ before Mr. Mcmullen leaves for Shanghai the day after tomorrow we should have a wonderful dinner party.
A．Had they arrived
B．Would they arrive
C．They are arriving
D．Were they to arrive
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