单项选择题

If the straggle for a sustainable society______, we must have some vision of what we are aiming for.

A．is to succeed
B．has succeeded
C．succeeds
D．succeeded
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单项选择题
The study shows that laying too much emphasis on exams is likely to ______ students’ enthusiasm in learning English.
A．hold back
B．hold off
C．hold down
D．adopt
单项选择题
Telecommuting is a new form of work ______ to work, such as fathers with children, the chance to work while remaining at home.
A．that affording those unable previously
B．affords those who were previously unable
C．affording those previously unable
D．afforded those previously unable
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