ImsorryIdidntansweryourcallbec

I'm sorry I didn't answer your call because I online.（　　）

A．

was studying

B．

studied

C．

am studying

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A．safe

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D．useful

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A．throw it away	B．take it off
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A．needn’t	B．shouldn’t
C．mustn’t	D．can’t

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—______. I will go there alone.

A．Either

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