摘要： He met many problems he was going over his lessons . A. before B. as soon as C. since D. while
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He met many problems------ he was going over his lessons.
A. before B. as soon as C. since D. while
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He met many problems he was going over his lessons.
|
A. before |
B. as soon as |
C. since |
D. while |
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He met many problems ______ he was going over his lessons.
[ ]
A. before
B. as soon as
C. since
D. while
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B. as soon as
C. since
D. while