单项选择题

Look! The children ______ on the ground happily. Let's join them.

A．play
B．have played
C．are playing
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单项选择题
Help ______ to the cakes, I said to the children.
A．you
B．yours
C．yourselves
单项选择题
Thursday is the ______ day of the week.
A．fourth
B．five
C．fifth
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