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Scientists say it may be five or ten years_____it is possibl

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Scientists say it may be five or ten years_____it is possible to test this medicine on hunman patients.
A since B after C before D when
____deserves the award will certainly get it
A who we think B whoever we think
c who do you think D whoever do we think
最好能告诉下 为什么是这个答案
Scientists say it may be five or ten years_____it is possibl
1.【答案】:C
【解析】:科学家说,在病人身体上测试这台机器【之前】,需要5到10年的时间.
难点:这里很可能after和before搞混,要理解,before控制的是后面的句子,也就是it may be five or ten years,before it is possible to test this medicine on human patients.
2.【答案】:B
【解析】:我们认为谁可以获奖,谁就会获奖.
首先,看到“will certainly get it ”之后,前面的必定是一个主语成分,但是在英语中,一个完整的句子是不能够当主语的,所以C和D排除.who是特指,whoever是泛指.在这里,获奖人还没有诞生,所以是泛指.