.–Howdidyouknowthesurprisingne

.
–How did you know the surprising news?
–I happened ______ the event then.

A．to be covering

B．to cover

C．covering

D．to have covered

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Some modem paintings are _____ my understanding; I simply can't understand what the painters really want to tell us.

A．within

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- Absolutely !__________.

A．It all depends

B． I mean it

C． You've got me

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- No, I only know, Mr johnson and Mrs Smith.

A．both

B．either

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—You were brave enough to argue with Mr. Smith.
—Well, now I regret _______ that.

A．to do

B．to be doing

C．to have done

D．having done

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Too much pressure from study leads to sleeplessness, which _______ increases the risk of forgetfulness.

A．in turn

B．in return

C．by chance

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