单项选择题

— What's the problem, Harry? --- （）

A.No problem
B.No trouble at all
C.Thank you for asking me about it
D.I can’t remember where I left my glasses

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单项选择题

A.so
B.however
C.as
D.because

单项选择题

A.take the place
B.took the place of
C.have taken place
D.have been taken place

单项选择题

A.was first found
B.was first discovered
C.has first been discovered
D.was seen first