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【单选题】
帮助文件的扩展名常为 ( ) 。A.
html 或 .dot
B.
PDF
C.
exe 或 .ppt
D.
doc 或 .txt
拍照语音搜题，微信中搜索"皮皮学"使用
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is used
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D.
have been used
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A.
hunting for
B.
carrying on
C.
looking after
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bringing up
【单选题】Every means ________, but we find that only by this means can we do it well.
A.
has been trying
B.
had tried
C.
has been tried
D.
have been tried
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