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I'm pleased to receive your letter of April 10th, __________for our catalogue and price-list.(2018年12月第25题)

A. ask
B. asked
C. to ask
D. asking

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This study has found some key factors________employee's stress in their work.(2018年12月第33题)

A. turning down
B. leading to
C. taking off
D. carrying out

When__________, the project will help to greatly improve the environment in the community.(2015年6月第34题)

A. finished
B. to finish
C. finishing
D. finish

We finally came to the conclusion _______it was difficult to combine the two techniques.（2019年12月第31题）

A. which
B. who
C. where
D. that

The customer service has refused to refund my money to me _______it is theri fault.（2019年12月第33题）

A. as if
B. ever since
C. even though
D. in case