good friend always gives you a helping hand ________ you are in trouble.[ ]A

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good friend always gives you a helping hand ________ you are in trouble.[ ]
A. when
B. before
C. until
D. though

答案

举一反三

I arrived at the airport ________ the plane had taken off.[ ]
A. after
B. while
C. when
D. before

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_______ Mr Smith didn’t feel well, he still come to give us lessons.[     ]
A.So
B.Because
C.Though
D.As

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—Why do you like him?
—____ he looks so serious.     [     ]
A. So
B. Because
C. When
D. How

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We often watch TV _____ the weather is bad. [ ]
A. as
B. when
C. as
D. that

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In the club, you can play chess ____ you can"t eat.           [     ]
A. so
B. or
C. because
D. but

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