单项选择题

It seems oil（）from this pipe for some time. We'll have to take machine apart to put it right.

A．had leaked
B．is leaking
C．leaked
D．has been leaking

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单项选择题
（）he was a regular customer, the boss allowed 10% discount off the prices of the goods.

A．Giving
B．Giving that
C．Given that
D．To give that
单项选择题
The course normally attracts 20 students per year,（）up to half will be from overseas.

A．in which
B．for whom
C．with which
D．of whom
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