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
You'd better let me know as soon as there is a(n) ______ position in the branch office.
A. empty
B. vacuum
C. hollow
D. vacant
单项选择题
Tom ______ in the paper as scheduled, but he was seriously injured two days ago.
A. was to hand
B. was to have handed
C. is to have handed
D. ought to hand
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