單項選擇題

“Must we start the experiment now?” “No, you （）.”

A.won’t
B.needn’t
C.can’t
D.may not

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單項選擇題

He keeps（）at himself in the mirror.

A.to look
B.looking
C.look
D.looked

單項選擇題

Don't disturb me. I（）letters all morning and have written ten so far.

A.write
B.have written
C.was writing
D.have been writing

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