单项选择题

He has made another wonderful discovery, ______of great importance to science.

A．who I think it
B．which I think it is
C．that I think is
D．which I think is
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单项选择题
I’ve never been there but it is, ______, a lovely place.
A．of no account
B．by all accounts
C．on no account
D．on this account
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