单项选择题

Classes will cease to exist by the time communism______ throughout the world.

A．is achieved
B．has been achieved
C．will be achieved
D．will have been achieved

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单项选择题

Bacteria are sometimes______ too small to be seen without a microphone.

A．far
B．rather
C．quite
D．very

单项选择题

There was clearly nothing left to do but sit down on the shabby little couch and weep.______.

A．Did so Della
B．So did Della
C．Della so did
D．So Della did

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