单项选择题

It is desirable thAt the airplane （） as light as possiBle.

A.is
B.were
C.Be
D.had been

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单项选择题

We finally （） an agreement after a lot of hard argument.

A.reached
B.did
C.arrived
D.drove

单项选择题

When doing the wash, it is important to （）white and colored clothing.

A.compare
B.separate
C.establish
D.contrast