单项选择题

It seems oil （） from this pipe for some time. We’ll have to take the 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

One more try, （） you will succeed.

A. or
B. but
C. so
D. and

单项选择题

Just as the builder is skilled in the handling of his bricks, （） the experienced writer is skilled in the handling of his words.

A. as
B. thus
C. so
D. like

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