单项选择题

Information and opinion gap exercises have to have some content ______ talking about.

A．worthwhile
B．worthily
C．worth
D．worthy
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单项选择题
It was dark in the cave so she ______ a match.
A．struck
B．hit
C．fired
D．burned
单项选择题
You should have put the milk into the icebox, I expect it ______ undrinkable.
A．became
B．had become
C．has become
D．becomes
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