房子前有一棵大树。There_____ a big tree in front of the house.
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你们班有多少学生?How many students ____ there in your class?
杯子里没有牛奶。Thereisn't _____ milk in the cup.
当MD20<=128时,Q0.0接通。则当MD20为()时,Q0.0接通。
A. 0000000110000000
B. 0000000001100000
C. 0000001001000000
D. 1111111111111111