单项选择题

Do earthquakes ______ often in North America

A．break
B．break out
C．happen to
D．occur
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单项选择题
It looks ______ the family has got a lot of problems.
A．as long as
B．as if
C．while
D．though
单项选择题
-- I've never seen that movie. -- ______ have I.
A．So
B．Either
C．Neither
D．Too
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