单项选择题

-- Why does Sara know so much about Angkor Watt
-- She ______ have been there, or because of some other reasons.

A．must
B．oughtn't to
C．may
D．can't
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单项选择题
If that idea was wrong, the project is bound to fail, ______ good all the other ideas might be.
A．whatever
B．though
C．what's more
D．however
单项选择题
It ______ a lot ______ we can develop something to substitute for petrol.
A．occurs; whether
B．matters; whether or not
C．happens; even if
D．minds; if or not
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