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

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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
单项选择题
The ties that bind us together in common activity are so（）that they can disappear at any moment.

A. trivial
B. fatal
C. tentative
D. feeble
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