The boy was observed __________ basketball at eight o’clock yesterday. A．playing

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The boy was observed __________ basketball at eight o’clock yesterday.

A．playing

B．play

C．to play

D．having played

答案

解析

略

举一反三

_______ at the back of the room was a shy girl with two big eyes.

A．Sat

B．Sit

C．Seating

D．Seated

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So far, several cases of a disease, ___________as H1N1, are reported to have been found in the country.

A．knowing

B．to be known

C．having known

D．known

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The environmental problem we are looking forward to _____ is __________ our attention.

A．see being solved ; worth	B．seeing solved ;worthy
C．seeing solved ;worthy of	D．see to solve; worth

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Is this the computer you want to _____?

A．repair it

B．have it repaired

C．be repaired

D．have repaired

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He is a man who is difficult ____.

A．to satisfy with

B．to be satisfied with

C．to satisfy

D．to be satisfied

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