Play, often _______ as an activity for young children, is still important in the social development of teenagers.
| A．to see | B．seeing | C．to be seen | D．seen |
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I must thank my parents ___________ to be a college student.
| A．to make it possible for me | B．to make it possible to me |
C．f or making it possible for me |
D．for making it possible to me |
They set off________a trip________London.
| A．on; for | B．on; to | C．for; to | D．for; for |
We've had ________ help from people.
| A．a great many | B．a large amount of | C．a great deal | D．a great number of |
—We really appreciate ________ us.
—My pleasure.
| A．you help | B．help | C．your helping | D．to help |
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