单项选择题

Diamonds have little（）value and their price depends almost entirely on their scarcity.

A. extinct
B. permanent
C. surplus
D. intrinsic

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单项选择题
The two scholars worked at the task of writing a preface to the new dictionary for three hours（）last night.

A. at length
B. in full
C. on end
D. in time
单项选择题
I must go now.（），if you want that book I’ll bring it next time.

A. Incidentally
B. Accidentally
C. Occasionally
D. Subsequently
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