—My mother still went to work yesterday ______she didn't feel well.

—My mother still went to work yesterday ______she didn't feel well.

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锅炉给水经()提高水温后,进入汽包。A.省煤器B.空气预热器C.汽包D.过热器

锅炉给水经()提高水温后,进入汽包。A.省煤器B.空气预热器C.汽包D.过热器

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John was busy, ______he could not come.A but B therefore C and D nor

John was busy, ______he could not come.A but B therefore C and D nor

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—Mathematics ______ study or science of numbers.A is B are C was D were

—Mathematics ______ study or science of numbers.A is B are C was D were

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—Listen! Who ______ in the next room? The voice is so beautiful.A sings B sang C

—Listen! Who ______ in the next room? The voice is so beautiful.A sings B sang C

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