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It is not until recently ______ the scientists have found proof of there being water on Mars.

A．when

B．that

C．how

D．what

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I have almost forgotten ________.

A．how Mr. Taylor's like	B．what Mr. Taylor's face is like
C．what Mr. Taylor's face is	D．which Mr. Taylor's face is like

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Do you have any idea ________

A．when Miss Smith will arrive	B．when will Miss Smith arrive
C．how will Miss Smith arrive	D．why hasn't Miss Smith arrived

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Last Sunday he made a promise ________ he was free he would take me to Qingdao.

A．if

B．that

C．that if

D．whether

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Last Sunday he promised ________ today, but he hasn't appeared yet.

A．that he would come	B．that he will come
C．he will come to see me	D．whether he would come

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At that time I had no idea ________ I could hand it to him without being seen.

A．if

B．how

C．which

D．that how

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