Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．when |
相关试题
The positive meaningswords in an ad and how they are presented in an interesting way play an important role in promoting a product.
| A．are attached to | B．attached to |
| C．attaching to | D．having attached to |
--- I thought he would give in to me.
--- That’s .
| A．what you are wrong | B．why you are wrong |
C．where you were wrong | D．which you were wrong |
You were out enjoying yourself when you ________.
| A．must have studied | B．would have studied |
| C．should be studying | D．ought to have been studying |
. She is a caring and helpful neighbor, all of us will always adore and be thankful to.
| A．/ | B．that | C．for whom | D．one whom |
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