It"s four o"clock in the afternoon. The boys _ at the pool.[ ]A. is s

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It"s four o"clock in the afternoon. The boys _ at the pool.[ ]

A. is swimming
B. are swimming
C. swim

答案

举一反三

Look! The workers a new bridge now. The traffic in Changchun will be better soon.[ ]
A. build
B. are building
C. built
D. were building

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—Where is Mr Black? I can"t find him.
—Oh, he his car behind the house now.[ ]
A. washed
B. is washing
C. will wash
D. has washed

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Look! A group of children _ a good time by the sea.[ ]

A. have
B. is having
C. has
D. are having

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— you photos?
—Yes, I am. [ ]

A. Do; take
B. Is; taking
C. Do; taking
D. Are; taking

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Don"t go out. It _ hard. [ ]
A. snow
B. snows
C. is snowing
D. are snowing

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