The question came up at the meeting ______ we had enough money for our research.
[     ]
A. if
B. what
C. that
D. whether
You can see as far as the Taibai Mountains on top of the building _____ the sky is clear.
[     ]
A. when
B. where
C. though
D. because
— May I go and play with my friend this afternoon, Dad?
— No, you can't go out _____ your work is being done.
[     ]
A. the moment
B. until
C. as
D. before
Lin Yong loves the feeling he gets ______ he is getting ready for a ride.
[     ]
A. since
B. though
C. when
D. until
— Did Jack come back early last night?
— Yes. It was not yet eight o'clock ______ he arrived home.

[     ]

A. before
B. when
C. that
D. until
_______ there is something else to discuss,I'll declare the meeting closed.
[     ]

A. As
B. While
C. Since
D. Unless

_____ you understand this rule, you will have no difficulty in finishing the task.
[     ]
A. Until
B. Once
C. Though
D. Unless
Ely worked late in the evening to finish her report _____ her boss could read it next morning.
[     ]
A. when
B. though
C. before
D. so that
_____ I had seen him yesterday at the airport!
[     ]
A. If
B. If only
C. Only if
D. Since
______ the day went on, we became closer and closer to each other.
[     ]
A. As
B. With
C. When
D. While
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