问题补充:
I had not been reading for half an hour I heard the steps outside.
A. when
B. while
C. as
D. since
答案:
(答案→)A. when
B. while
C. as
D. since
解析:可联系答.案.网客服索取。
时间:2020-02-19 21:33:25
I had not been reading for half an hour I heard the steps outside.
A. when
B. while
C. as
D. since
(答案→)A. when
B. while
C. as
D. since
解析:可联系答.案.网客服索取。