He met many problems------ he was going over his lessons.

He met many problems------ he was going over his lessons.

#57608

before

as soon as

since

while

推荐题目

 - What's wrong with you, Madam? - I've lost my valuable painting. But a week had gone by _______ I knew it was missing.

#55958

while

since

until

before

Tom didn’t go hiking with his classmates ____ his illness.

#55670

because

because of

since

—How many hours do you sleep every day ?—            .

#56286

Once a day

Eight

Usually

Three times

________Switzerland (瑞士) is very small , _______it is the land of watch and it is very rich.

#55472

Though; but

Because ; so

Because ; /

Though ; /

Eric has got two aunts，________ he hasn’t got any uncles．

#58126

and

but

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