Zhangqiang is said ______ the experiment in the lab, but I can’t find him there.
A．to have done B．to do C．to be doing D．doing
I’ll go to meet you if I ________ free then.
A．will be B．would be C．am D．Was
Jane helped me with my work last week when I asked for leave. ______, I’ll invite her to have dinner with me.
A．In return B．In turn C．In time D．In vain
Mo Yan has published dozens of novels, of _____some are very popular among Chinese readers, Red Sorghum, for example.
A．those B．whose C．whom D．Which
_____you have to do the job, you should try your best to do it well even though it may be very difficult for you.
A．Since B．While C．Unless D．Though
Sorry, I am too busy now. If I _____ time, I would certainly go for an outing with you.
A．have B．have had C．had had D．had
