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【简答题】
Est-ce qu'il a remis tout de suite l'argent à sa mère?
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】They ___ every means, but the engine __ work.
A.
tried; couldn't
B.
have tried; won't
C.
tried; won't
D.
have tried; can’t
【单选题】Every possible means ____, but none ____ successful．
A.
has tried; has proved
B.
tried; proves
C.
has been tried; proves
D.
is being tried; is proved
【简答题】新民主主义社会的起止时间是 年到 年。
【单选题】_____many times, they succeeded _________ the experiment.
A.
Having tried; in doing
B.
Tried; in being done
C.
Having tried; to do
D.
Tried; doing