________ regular exercise is very important, it"s never a good idea to exercise
题型：同步题难度：来源：
| ________ regular exercise is very important, it"s never a good idea to exercise too close to bedtime. |
| [ ] |
A. If
B. As
C. Although
D. Unless |
答案
| C |
举一反三
| Jack wasn"t saying anything, but the teacher smiled at him ________ he had done something very clever. |
| [ ] |
A. as if
B. in case
C. while
D. though |
| He had no sooner finished his speech ________ the students started cheering. |
| [ ] |
A. since
B. as
C. when
D. than |
A new survey shows that 54 percent of Americans do not take prescription medicines ________
though they are important to their health. |
| [ ] |
A. as they instruct
B. as were instructed
C. as to be instructed
D. as instructed |
| Frank insisted that he was not asleep ________ I had great difficulty in waking him up. |
| [ ] |
A. whether
B. although
C. for
D. so |
| As is reported, it is 100 years ________ Tsinghua University was founded. |
| [ ] |
A. when
B. before
C. after
D. since |
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