单项选择题

______ that your son is well again, you no longer have anything to worry about.

A．Since
B．Now
C．When
D．After
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单项选择题
Don't let your mother tongue ______ with the foreign language you are learning.
A．interpret
B．confuse
C．interfere
D．puzzle
单项选择题
______ late in the evening that the geological team pitched camp.
A．It's not until
B．It was until
C．It is till
D．It was not until
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