..Whoitbethatisknockingatthedo

.
.---Who ________ it be that is knocking at the door?
---It________ be Mother, but I’m not sure.

A．can; must

B．can; may

C．must; can

D．may; must

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相关试题

No advertisement so far______can have the same effect as this one.

A．made

B．has been made

C．being made

D．to be made

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A healthy life is frequently thought to be______with the open countryside and home-grown food.

A．tied

B．related

C．involved

D．associated

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—Wow,your picture looks splendid!
—I______it on my computer.

A．drew	B．draw
C．will draw	D．had drawn

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In the past,ice ______food.

A．used to keep

B．used to be used for keeping

C．was used to keeping

D．used to be used to keeping

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Enough______ to stop the forest______ since the 1980’s.

A．has been done;be cut down

B．has done;cutting down

C．has been done;being cut down

D．had done;from being cut down

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