单项选择题

Many people agree that ______ knowledge of English is a must in ______ international trade today.

A．a; /
B．the; an
C．the; the
D．/; the
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单项选择题
Shall we stay at school or ______to the park
A．to go
B．go
C．going
D．went
单项选择题
--How long ______ each other before they ______ married--For about a year.
A．have they known; get
B．have they known; were going to get
C．do they know; are going to get
D．had they known; got
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