It has been proved ____ several new kinds of medicine____ a positive effect on the cure of H7N9.
| A．which，has | B．if, has |
| C．that, have | D．what, have |
相关试题
56. I found _______impossible for _______to work out the maths problem.
| A．it; him | B．it; he | C．that; him | D．that; he |
57. Few pleasures can equal _____ of a cool drink on a hot day.
| A．some | B．any | C．that | D．those |
58. I hate ______ when people talk with their mouths full.
| A．it | B．that | C．these | D．them |
59. Mary learned Chinese for about two years, _______is, from 1993 to 1995.
| A．this | B．that | C．it | D．he |
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