1.He is working in a factory.It ________ a half year since he ________ a college student.
A．is；was B．has been；become C．is；became D．has been；became
2.________ carefully, the mixture was bitter.
A．Tasted B．Tasting C．Taste D．To taste
3.How many of us ________， say, a meeting that is not important to us would be interested in the discussion?
A．attended B．had attended C．attending D．have attended
