单项选择题

The new e-ticketing system, ______ was installed last month, is working well.

A. what
B. whom
C. where
D. which
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单项选择题
A. interest B. interesting C. interested D. interestingly
A. interest
B. interesting
C. interested
D. interestingly
单项选择题
A. occurB. take placeC. manageD. happen
A. occur
B. take place
C. manage
D. happen
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