题目内容

Although Mr smith is one of those teachers who appear to be friendly, ______ he is very hard to deal with.

A. but
B. so
C. so that
D. yet

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______ a baby kangaroo is four months old does it begin to live outside its mother’s pouch.

A. Until
B. Not until
C. After
D. Only until

The earliest kind of desk was a box that had a sloping lid _______ there was storage space for writing materials.

A. under that
B. under which
C. which
D. that

I won’t lend any money to Joe because I am afraid ______ he will forget to pay it back.

A. if
B. whether
C. that
D. of

______ human beings depend to a great extent on forests, every effort must be made to preserve trees and wildlife.

A. If
B. Unless
C. Until
D. Since

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