单项选择题

If everyone makes a contribution () the environment, the world will become much more beautiful.

A．protect
B．to protect
C．protecting
D．to protecting

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单项选择题
Do you know().

A．who writing is she to
B．who he is writing to
C．she is writing to whom
D．who is she writing to
单项选择题
()is one of the world's most popular water sports.

A．Skating
B．Surfing
C．Baseball
D．Running
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