单项选择题

The one-year course is only to（）the foundations of good technical training.

A．lead to
B．let down
C．come to
D．lay down

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单项选择题

Henry：Well，I arranged with Bob and Chris to meet me here for a drink，but （）
Tom：They are probably held up by the traffic.

A．I wonder what it is.
B．they came late.
C．neither of them has turned up.
D．you can never tell.

单项选择题

His decades of effort began to（），for his new breed of rice had become more popular.

A．pay off
B．call off
C．pull off
D．lay off