I ______ for Shanghai this Saturday, so I want to know when the earliest plane ______.A.leave; takes offB.am leaving; takes offC.leave; is taking offD.am leaving; is taking off
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B解析试题分析：由this Saturday可知应为一般将来时，am leaving 是用进行时的形式表将来时的一种用法，这种用法多是表趋向的动词例如：leave /arrive /e/ go /die等。第二个空飞机什么时候起飞，属于已经制定好的，即为事实，所以用一般现在时。故