皮皮学，免费搜题
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【单选题】
演示实验的类型不包括以下哪种类型( )。A.
直接演示
B.
动画演示
C.
虚拟实验
D.
模拟实验
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】— _____ have you been learning English? — I have been learning English for six years. [ ]
A.
How long
B.
How often
C.
How far
【单选题】—Oh, you have a headache and a cough.______ have you been like this? —Two days. [ ]
A.
How many
B.
How long
C.
How often
【单选题】—How many times have you been to China? —In fact, it is the first time I __________ here.
A.
have been
B.
am
C.
had been
D.
was
【单选题】—Oh, you have a headache and a cough. __________ have you been like this? — Two days.
A.
How long
B.
How often
C.
How old
D.
How many
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