13.Theyweresurprisedthatachild

13. They were surprised that a child ______ work out the problem while they themselves couldn’t.

A．should

B．would

C．could

D．might

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—Oh, how nice! Do you know when she ?

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C．has left	D．left

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A．unless

B．when

C．until

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—That’s right. ______.

A．Great minds think alike

B．Two heads are better than one

C．In the end things will mend

D．Look before you leap

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A．take up	B．make up
C．pick up	D．build up

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