请将 “open the window!”改写成现在进行时
A. He are opening it.
B. He is opening it.
C. He was opening it.
请将 “Sharpen this pencil!”改写成现在进行时，以下正确的一项是
A. She is sharpen it.
B. She was sharpening it.
C. She is sharpening it.
请将“Dust the cupboard!”改写成现在进行时，以下正确的一项是：
A. He is dusting it.
B. He dusts it.
C. He are dusting it.
请将 “Look at the picture!”改写成现在进行时，下列正确的一项是：
A. She is looking at it.
B. She looks at it.
C. She was looking at it.
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