A、 so
B、 or
C、 but
D、 for
答案:C
A. because
B. where
C. once
D. although
A. explain
B. explains
C. toexplain
D. explaining
A. to have looked
B. looked
C. looking
D. to look
A. receives
B. produces
C. sends
D. earns
A. then
B. when
C. suddenly
D. and
A. To have changed
B. Change
C. Changing
D. Being changed
C. That’s all right
D. Sorry
A. hold
B. reduce
C. provide
D. catch