Since the road is wet,() last night.
A. it must have rained
B. it must rain
C. it must be raining
D. it must have been raining
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双揪铃铛法时,术者以两手()操作。
A. 拇指与食指
B. 拇指与中指
C. 拇指与无名指
D. 拇指与小指
外商直接投资的优点有()
A. 利用外国资金
B. 引进外商先进管理经验
C. 共担风险
D. 独享盈利
E. 获得外商先进技术