单项选择题

Most parents encourage their children to take an active part in social events, ______ those events do not interfere with their studies.

A. lest

B. so that
C. unless
D. provided
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单项选择题
I ______ the meeting yesterday, but some urgent matter prevented me from coming.
A. ought to attend


B. was about to attend
C. was to have attended

D. was to attend
单项选择题
The conference ______ a full week by the time it ends.
A. has lasted


B. lasts
C. will have lasted


D. is lasted
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