[ Prepositions ]
The english test will begin _____ 9 o’clock sharp in the morning.
A. since
B. in
C. on
D. at

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Coordinating Conjunction › ViewThat kind of bird is rare ____ beautiful
A. or
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We……………..(do) our work if our computer had not broken down.
A. have done
B. had done
C. do
D. done