Anyone can borrow books from this library _______ he keeps them clean and return

题型：不详难度：来源：

Anyone can borrow books from this library _______ he keeps them clean and returns them in time.

A．even if

B．unless

C．so that

D．as long as

答案

解析

略

举一反三

Mother shut the window ______ she might keep the insects out.

A．because

B．in order that

C．till

D．as

题型：不详难度：| 查看答案

They agreed to rent the house ______ the roof should be repaired.

A．on condition that

B．as soon as

C．when

D．unless

题型：不详难度：| 查看答案

The old woman has loved Tom _____ he were her son.

A．because

B．as

C．if

D．as though

题型：不详难度：| 查看答案

Substances will expand or contract ______ heated or cooled, but this is not the case with water.

A．when they will be	B．if they will be
C．as they being	D．when

题型：不详难度：| 查看答案

It will not be long _____man can harness the solar energy and make it serve mankind.

A．since

B．before

C．when

D．after

题型：不详难度：| 查看答案