It’s half past four. School is over. The children___ games happily on the playground.
A．playB．a(chǎn)re playingC．playedD．have played
B

這題考查時(shí)態(tài)，根據(jù)句意：現(xiàn)在是4點(diǎn)半，學(xué)生是正在操場做游戲，用現(xiàn)在進(jìn)行時(shí)。選B。
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