单项选择题

The smart phone benefits us a lot, hut the had effect ______ has on the youth can not be ignored.

A. that
B. which
C. it
D. one
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A. weigh B. eight C. seize D. neighbor
A. weigh
B. eight
C. seize
D. neighbor
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A. may B. day C. stay D. Sunday
A. may
B. day
C. stay
D. Sunday
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