I was doing some shopping in the supermarket______ it suddenly occurred to me t

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I was doing some shopping in the supermarket______ it suddenly occurred to me that I"d left my
wallet at home.[     ]
A. when
B. while
C. until
D. before

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举一反三

She had just finished her homework _____ hermother asked her to practise playing the piano yesterday. [     ]
A. when
B. while
C. after
D. since

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One Friday,  we were  packing to leave for a weekend away  ____ my daughter heard cries for help.     [     ]
A. after
B. while
C. since
D. when

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Tom was about to  close the window _____ his attention  was caught by a bird.          [      ]
A. when
B. if
C. and
D. till

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Mary made coffee ____ her guests  were finishing their meal.   [     ]
A. so that
B. although
C. while
D. as if

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— Where ____ Chongqing do you decide to build the factory?
— Nobody ____  our manager knows .[     ]
A. except; besides
B. but; besides
C. but; but
D. except; besides

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