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    Only after _____ the exam did he begin to regret not having studied harder before.

    A．had he failed                                            B．would he fail

    C．he had failed                                            D．he would fail

    C
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    Only after__________ his work __________ to see his grandfather.

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    Only after he took off his sunglasses ______ him as one of my favourite movie stars.

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    In recent years, an increasing number of teenagers have the problem of obesity（肥胖）. This problem shouldn’t be ignored. It’s harmful disorder that can cause a number of health problems in children.

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