题目内容

She had just finished her homework________her mother asked her to practise playing the piano yesterday.

A. when
B. While
C. after
D. since

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—I may go to the market this afternoon.—Could you please buy some fruit for me________you are there?

A. since
B. If
C. while
D. as

Theengineers aresobusythattheyhavezerotimeforoutdoorsportsactivities,_______theyhavetheinterest.

A. wherever
B. Whenever
C. evenif
D. asif

The girl had hardly rung the bell _____ the door was opened suddenly, and her friend rushed out to greet her.

A. before
B. until
C. as
D. since

环境是由众多因素交错而成的整体,主要分为1,2,3三4个大类。