问题

Laughter, along with an active sense of humor, ______ protect you against a heart attack, according to a recent study

A:have helped
B:helped
C:help
D:helps

正确答案是：

同类题型

They arrived at a farmhouse, in front of ______sat a small boy.

20The actress looks very young but _______she is more than forty years old

Everyone must _____ the security check (安检) before getting on the plane at the airport.—Yes. It’s necessary to ensure the passengers’ safety.

We all feel it is Jack as well as his wife that ______ for their son’s bad performance at school.

Do you enjoy_____