Scientists study ____ human brains work to make computers.
| A．when | B．how | C．that | D．whether |
相关试题
–Can I help you? Are you looking for anything in particular today？
----_____， we’re just looking.
A．Yes， please |
B． No, thank you | C．Yes ， you can | D．No, you needn’t |
I’m afraid Mr.Harding ____ see you now . he’s busy.
| A． can’t | B． mustn’t | C． shouldn’t | D．needn’t |
I refuse to accept the blame for something _____ was someone else’s fault.
| A．who | B． that | C．as | D．what |
Linda ，make sure the tables ____ before the guests arrive.
| A．be set | B． set | C．are set | D． are setting |
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