_______is this pen?

It was at this time ____ he adopted the pen name “Mark Twain”.A: whenB: thatC: at whic

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"Can I borrow your pen？"______"You have a pen."A．is inconsistent withB．entailsC．is contrad

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Liu Xiang is ______ this season.

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-- Is this your shoe? – Yes it is but where is ________?

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This MP3 is ______ that one.

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The pen ______he is writing is mine. A.with which B.in which C.on which D.by which

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—Whose book is this? —It’s______.

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