When do I need to use an apostrophe?什么时候用撇号？Answer these questions, using the words in parentheses. Put the apostrophe in the right place.用句后括号中的词或词组来回答问题, 注意撇号的位置.'It's' (with an apostrophe) should be use...
他们已在临床试验中接受过这种药物的治疗。They have been treated with this drug in clinical trials.这只不过是你可以做的各种试验中的一例罢了。That's just one example of the kind of experiments you can do.跟我说说你的临床试验。进展如何？Tell me about your clinical trials. How...