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王老师:19139051760(拨打)
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第1题

These construction workers are required to participate______the safety training program. A、at B、with C、in D、
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第2题

Vitamin B enables the body to______full use of the food taken in. A、make B、reach C、put D、bring
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第3题

The task will not be fulfilled______we get help from the other departments. A、if B、unless C、since D、when
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第4题

When______,the project will help to greatly improve the environment in the community. A、finished B、to finish C、
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