Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.
| A．why | B．how | C．unless | D．where |
相关试题
Listen ! The matter ___________has somethin
g to do with all of us.
| A．to discuss | B．to be discussed |
| C．being discussed | D．having b een discussed |
_______-after his death that he was recognized as a great composer.
| A．It was not until | B．Until | C．It was until | D．Not until |
__________you eat the correct foods ________ be able to keep fit and stay healthy.
| A．Only if ; will you | B．Only if ; you will | C．Unless; will you | D．Unless ; can you |
_________kinds of animals in the world died out___________proved true.
| A．All ; has | B．When some ; have | C．While all ; have | D．That some ; has |
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