单项选择题

By the year 2010, scientists probably ______ a cure for cancer.

A．will be discovering
B．are discovering
C．will have discovered
D．have discovered
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单项选择题
There Was a knock at the door. It was the second time someone ______ me that evening.
A．had interrupted
B．would have interrupted
C．to have interrupted
D．to interrupt
单项选择题
When Jane fell off the bike, the other children ______.
A．were not able to help laughter
B．could not help but laughing
C．could not help laughing
D．could not help to laugh
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