单项选择题

I must be off now, （）I’ll be late for the meeting.

A. but
B. and
C. for
D. or

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单项选择题My neighbours used to give me a hand in time of trouble, （）was very kind of them.

A. who
B. which
C. that
D. it

单项选择题______ should one help each other, ______ he should learn from others.