单项选择题

Thank you for giving me a hand. I ______ in the experiment without your valuable help.

A．have failed
B．will fail
C．would have failed
D．must have failed
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单项选择题
The more one is ______ the English-speaking environment, the better he or she will learn the language.
A．exposed to
B．filled in
C．caught on
D．kept on
单项选择题
Many Beijingers have already learned enough English to ______ a conversation with an English speaker.
A．go on
B．carry on
C．get off
D．get over
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