单项选择题

Try ______ the green button to see if the machine will start.

A．press
B．to press
C．pressing
D．to have pressed
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单项选择题
He brought off the first prize in the speech contest. Without your help, he ______.
A．would succeed
B．will succeed
C．would not succeed
D．would never have succeed
单项选择题
That there really was something could not be doubted, and, the ______ were invited to put their finger on the wound of the Scoti
A． credulousB. credibleC. incredulousD. incredible
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